you've got a frame, one style wheel/tire that was used on that version frame (you can use 6" wheels too on those), and some optional fenders. Look at the 1970 catalog (blue with the creepy looking kid pulling a wheelie on a chopper on the front) or the 1971 full color brochure and pick a bike ranging from 400-500 or 700 in 1970 or "cobra" or "skyhawk" in 1971. Pick the one that you like the best, and start hunting for parts, to build that version. The main variances would only be the seat, wheel size, and engine size. You have fenders so you can swing either way if you gotta make it something seen in the brochures.
I'm not sure if the 1970 catalog is actually uploaded and online anywhere, but the 1971 is on minidoodle.com in the brochures section.
Good luck with it!