Alot of that stuff is still made today
http://azusaeng.com/ , you don't even have to be crafty since just about everything can be ordered. Or you can download plans from the interwebs in case you
have to say you built it
yourself.
G and I built a clone of a hard tail Bonanza a couple years ago from scratch, more Princess auto parts than Azusa, but it's way cool and can still scare the sh*t out of you if you go too fast, we are up to ~ 8 hp on it now, big fun. G learned about blueprint reading, calculating curves and radius', tube bending (as well as shopping on CL for the bender and dealing with strange sellers), welding, gear ratios, and what happens when you put too much hp into something designed for 2 hp with tiny little wheels. :O
Priceless, even though I ended up doing most of the actual work
Whatever you build or buy put the shocks on the back, or invest in some serious foam for the seat, that thing is a tooth rattling butt punisher right now.