yeah i just built a mid BB version with 15" stays and am going to tool around on it to see what diff that makes... On a 26" frame, a 12 high BB is harder to pull back into a manual than a 12.75. Its also harder to hop and spin from flat. Lower BBs are much more stable on dirt... I think if i ever make 4X frames they'll be closer to 12-12.5

 Very nice! I had pretty much the same idea, had a buddy build one for me.
What specs did you go with?
Here's mine:
TT 22.5" CS 14.5" BB 12" HA 70 Deg.
www.pinkbike.com/photo/4956403

 Kinda long on the Chainstays, but it sounds like the high bb makes it work well! I would like to try a higher BB, just never have had a bike with one higher than about 12" so I'm hesitant to try it.

 25.4 seatpost- BMX size. Euro BB... Mid BB frames in production today...

 Awesome frame!