This is a custom build mountain bike project I just recently completed. It's a flyxii full carbon fiber frame. I only rode the frame once, and it rides perfectly. I basically got a carbon fiber frame and built it up with parts. It is a size 15 inch frame. Im 5 11 and it fits me great. Its a small frame but with 29 inch wheels it fits like a medium. I would say it could fit from 5 8 to 6 foot. This has hydraulic disc brakes, through axles, 1 by 11 drive train, tubeless rims, and bb30 bottom bracket. Crank brothers stamp 3 pedals.
I spent 1,700 for all the components on this bike

ROCKSHOX RECON RL 29" 15X100MM AXLE SOLO AIR 120MM
Crank: SRAM NX 175 BLACK XSYNC 32T
Rear Derailleur: SRAM RD NX 1X11SPD
Brakes: SHIMANO DEORE, 180MM