Sora just posted a walkthrough for Cube. It doesn't seem SO bad apart from the final boss.
I guess that's not too hard, I got the echelon's to handle it, but boy does it not look fun.
As an aside I did the stats breakdown and it seems like mid-tier and high tier heavy construction are completely useless. Well maybe not completely if you desperately want to save manpower/ammo/ration/parts, but those are easy to farm so no one should be that desperate. Everyone was kind of already saying this so I won't give a full number break down, but suffice to say even if you have every 3* like me, moving to a higher tier construction to take them out of the pool isn't worth it, because you have a better chance at getting what you want by doing the cheaper construction more times.
Possibly more interesting, is if you aren't looking for a shotgun, then don't wait for heavy construction. Doing a normal construction for say, an MG 10 times, would cost as many contracts (and this time it would also cost the same number of resources) as a heavy construction and give you a better chance at whatever 4 or 5* you're shooting for. Up until recently I was doing a lot of rolls trying for PK, and I know some other people were shooting for MG5 or one unit or another, basically if that unit you want isn't an SG, stick to regular construction. Of course I want SGs even more than PK so I'll do at least 10 heavy constructions, but after that I wouldn't do more than 1 a week and wait for those 5* rate ups I keep hearing are coming.
