Just to clarify, my old AM build thread on FISD was my TK (sold it to a garrison member). My Stop that Ship TD build on MEPD is an ATA HIPS kit. It's been sturdy and troops just fine, in fact I kind of abuse it and toss it in a box and have never had any cracks. The only crack was when someone knocked my helmet off a 5 foot tall shelf and the chin cracked at the thinnest part. Nothing some plastic weld and shim didn't fix.
I can't recommend AM anymore to be honest, so much work to get them looking right. I would suggest ATA HIPS or ABS. The new AM (NE - No Excuses I think?) is still a little ways out, and I'm not 100% sure of the sizing (exactly how big it is).
RT mod is a friend of mine too, great quality stuff. Just his real day job (pilot) keeps him busy, and his armor stuff is more of a hobby.