American flat track.

[hondadownunder_imp]

I'm moving back to the UK early next year, and going to be setting up a restoration / specials building business. I'm interested in building a couple of flat trackers from the 50's - 80's period. I'm looking for a bit of inspiration for maybe doing a road going replica of an early HD or something that was maybe not so well known outside of the USA.
Are there any books/magazines that cover this period that you could recommend ?
Also, any pictures or info on the CX500 based flat tracker that I believe preceded the NS750 ?
Many thanks in advance.