Shifter Kart!

Anyone have any schematics, info, ideas or such for these things?

I’m taking a 250 Ninja or 400cc engine out of a VFR400 or EX250 to build a shifter kart for autocross with true suspension and adjustable coilovers, I need some info on how to get these frames going and such.

I’m working on the engine and my buddy is doing the welding.