So I think I may just build this 12.5" rifle...

But I also think I will actually do an 11.5" SBR...

Here is where I am at so far.

Upper:
1. VSEVEN 11.5" barrel
2. MI 10.5" Combat rail
3. MI Forged upper
4. Toolcraft BCG
5. Radian Raptor LT
6. SiCo Maad mount (already have)

Lower:
1. I have either a Lanco Tactical (local shop) or Spikes punisher unfinished that I could form 1
2. ALG ACT trigger
3. LPK
4. Magpul Stock and grip

I think I am going to go big for the barrel with solid, but not premium parts for everything else. I can do all this for about $1000 before stamp with already having a lower ready to go.