Last night, I ran across some kits on a Japanese pedal site. The instruction sheets are well done and include schematics. Here are a few of them for you enjoyment:
http://kandr.dyndns.org/product/kits/man-tonebox.pdf
http://kandr.dyndns.org/product/kits/man-q-triper.pdf
http://kandr.dyndns.org/product/kits/man-miniboosterplus.pdf
http://kandr.dyndns.org/product/kits/man-drivebooster.pdf
http://kandr.dyndns.org/product/kits/man-distortion.pdf