So I put in some effort and have the Amiga mainly wired up in the case:
I first put down some packing tape on the bare metal to prevent any sort of accidental short, then drilled in and installed risers in multiple locations matching the Amiga board and ACA 1233n accelerator (which also has screw mounts). Then I ran the wire for the keyboard port and installed it in the appropriate spot on the case, taping the keyboard wire down to keep clutter out.
I drilled some holes in the case and routed the ATX->Amiga power supply converter cable around the edge of the case using zip ties. I need to manually mix the audio from 3 different sources on the amiga - I need to mix the paula output and the CD-ROM Drive output together, which I do using a bracket that contains some electrical parts to amplify the volume. That bracket expects the Paula out to come in via RCA jacks, so I've run RCA cables from the audio-out ports on the Amiga to an RCA jack that I feed through a PCI Bracket with a hole in it. I tied up the excess audio cable and zip tied it to keep it clean.
The CD-ROM Drive is mounted. I went with a beige one instead, thinking it felt more 1990's. There used to be a bracket that was riveted onto the case that went on the left side of the CD-ROM drive that provided screw holes for it, along with screw holes for the right side of the floppy drive bays. But that bracket was right in the middle of where I needed to mount the Amiga 1200 motherboard, so I had to remove it. This means that the CD-ROM Drive is held entirely by the right side of the case. This isn't that bad, though, as there are 4 screw mounts on that side and there is also a slight shelf for the CD-ROM drive to sit on. With all 4 screws mounted, the drive is solid and isn't really going anywhere. Additionally, the CD-ROM drive face sticks out quite a bit, and actually rests on the molded plastic of the front of the case, which is screwed into a metal plate.
I spent a little bit of time playing origami to get the ribbon cable properly laid in the case. By pressing tightly with my thumb at the folds, I could get it to lay down stiffly in the case.
I also lopped off all the excess and unused ports on my spare PSU that I'm using for the project, because they contributed a significant amount of clutter in the case. I coated the tips of these cuts in hot glue to prevent accidental shorting.
I want to have two floppy drives - the first an actual Amiga floppy drive, and the second a Gotek Floppy Drive emulator, but i only have one 2.5" IDE port and cable. Luckily, a few years ago, I picked up this hacked up cable from a guy on AmiBay. It plugs into the floppy drive port on the back of the Amiga and outputs to a standard 2.5" IDE cable and power connection.
I have the cable permanently installed into the floppy port under the CD-ROM drive. Again, hot glue on exposed terminals to prevent shorting.
In the front of the case, I managed to install the Amiga LED plate in the exact spot where a window existed for a Turbo Speed LCD Display prior. The case would hook up to old motherboards with turbo buttons on them and output the speed of the 286 or whatever was connected, so the user would know if they were operating at 16 mhz or 66 mhz or whatever.
You can see the 3 LEDs just barely poke in through the window. Tried turning it on and all 3 are clearly visible.
I want to print out a sticker to place over that entire front panel. This is a mock up of what I'm currently playing around with. The boing balls would be stickers to place on top of the reset buttons, while the white squares would be cut out to align with the LED spots on the window. I need to make sure the measurements are correct, but feedback is welcome.
I went ahead and installed a modern SATA HDD with just some L-brackets to mount it to the case. This will make attaching the HDD to a modern PC easier for me (as I have a SATA->USB adapter) which will let me use WinUAE to easily partition and install stuff on the HDD.
I'm using a SATA->PATA adapter for this. I haven't actually tested to see if it works with the Amiga, but I assume it should. I've used it in retro 486 PCs before without issue. If anybody knows if this is going to cause a problem, please speak up. I don't want to use CF kits unfortunately. This is being fed into a quad-buffered IDE interface I posted earlier. Before, I had tested it out with a 8 gb PATA drive and got it recognized under workbench, so I'm hoping for no problems with this SATA->PATA HDD.
Got the Floppy Drive and the Gotek Floppy Drive emulator installed. They go into a cage that you screw into the case. The left half of the cage is held by a metal bar that spans the width of the PC case, giving additional support to the top of the case (which is strong enough to hold a CRT monitor). The cage screws into the top of this metal bar. The other side of the cage was supposed to screw into that riveted bracked I removed earlier. However, to an even greater degree than the CD-ROM Drive, both the gotek floppy drive emulator and the real floppy drive stick way out of the front of the case, resting on both the plastic and the metal. And I've tried putting everything in the other way around and it's the same way. It seems the drives are supposed to actually stick out this much on this case, which is fine as it provides a ton of stability and support to the floppy drive. Overall, all the drives in the case are firmly mounted and not moving, despite removing that bracket.
The wiring is still pretty clean. I'm playing around with bracket locations on the back to see what kind of configuration I like best. I'm still waiting for a parallel cable and a 25pin serial cable to arrive for me to mount. Ultimately, I think I will forgo putting the mediator in as there is no real need anymore. I was planning on using flex PCI risers to work with the mediator, but my main reason for getting a mediator was to install a soundblaster card with. However, I have a prisma megamix music card coming in which accomplishes the same goal I was going for -- MP3 playback, that I don't feel the need anymore.
I also am waiting on a second angle adapter for my PCMCIA port so I can install the wireless adapter. But, unfortunately, both the prisma music card and the angle adapter are in the mail and thus I'm pretty much at a stand still.
EDIT: Regarding the large white bay in the front:
I have decided that I am going to mount the controller ports to the front of that bay on one side, and then on the other I want to put an Amiga logo sticker.
Since virtually everybody thinks the post-death logo is trash, how about this one instead:
BTW sorry if some of the photos are blurry. Phone-hands.