Hi,
Here's a link to a RUCC build,
RAW's Cobra Kit Car., not mine but, very informative.
I have an assembly manual in electronic form; PM an email address and I'll send it.
Probably the most distinguishing feature of the RUCC cars is the apron around the engine bay, kinda makes the engine look like it's in a bathtub. Some people like it and some don't.
Roger had two frames; a ladder and a backbone, both very strong and each would accommodate an 8.8 solid or TBird IRS rear end and both used the Mustang II front end components although he offered a tubular A arm setup as an option. My car has the tubular A arms and IRS options.
There are no identifying numbers on the frame or body and no MSO issued from RUCC for their cars.
As far as parts go, you're pretty much on your own as Roger hasn't been around for some time.
There is a RUCC sub-forum on the site but, there isn't a lot of activity there.