These guys have taken a somewhat unusual approach, for the construction of their Center TUB, in that they use a welded aluminum structure as opposed to a tube frame or riveted monocoque... if you take a close look at the pics there are a lot of ideas for the homebuilder...
as well as a great project for those that can afford to purchase the component car... to drive or race...

http://www.race-car-replicas.com/rcrfacility.html

a little bit awkward the way they have done the thumbs but if you are patient... there is a lot of detail there.....

with some woodworking skills and a Good TIG machine... or Pulse MIG..........no telling what a home constructor might accomplish....