Build, you say? crappy picture but it's all I have.
Here is what will be my bike for the variated class.
Piston crown ceramic coated, skirts teflon
Dremel-milled head (with decomp)
HPI dual curve ignition with programmable curves
Adapter for Gila reed block - V-Force reeds
Custom intake mated to TM24 flatslide with cable-choke conversion
Frame chopped and braced to allow clearance for the bigger reedblock and intake (no strechy)
MLM Devin sidebleed pipe
Subframe braced and strengthened in some places, lightened where possible
Puch EBR hydro forks, Puch 5-star with Mike Thomas disc brake, caliper/cylinder/lever from 77
Strengthened/modified clipons from treats
DIY fiberglass (with steel supports) seatpan, padding is hacked-up pilates mat I "borrowed" from my wife, covered in perforated marine vinyl
Quick-release headlight and taillight in progress (for street tuning)
I think that's the big stuff. I needed to make a fast bike because i'm a slow rider.