The other night I looked very hard on google for any other blueprints, perhaps a hundred or more sites,
including numerous photographs.
Did not find any other blueprints. Found the same blueprints on several other sites.
The red front end was the best, and seemed to match up well with your current top and side blueprints.
There is one photo with some of the bottom of the car, at an angle of course :-)
There is a 3d model for sale.
http://www.hypr3d.com/ makes 3d models from your own photographs...

The preceeding post seems to be good advice to me...

http://www.foundationpc.com/brochure/68broch/cover.jpg