Pat,
To help you with your choices, you might look at the smorgasbord of vintage B-TR contained in "Aircraft Speed and Vintage Team Racing," by Gordon Rae. There's usually one or two for sale on the web. It has a bunch of small scale outline drawings and three(?) somewhat larger repros of some British planes.
There were a lot of published plans in various magazines. Not sure if the AMA collections have those or not. I have binder with quite a few of these magazine-sized articles. I could probably post a list of which ones, along with the magazine name and date, if that helps you?
I think there would be more interest in the vintage era--before fiberglass shells. However, the earliest B-TRs have, shall we say, a lot of unique character, and perhaps would not be considered attractive. Good looks was one of the cornerstones of the event....
Dave