[Mike Dozier]

specracer

The problem with your request (and it's been asked before)
is that each company has their own unique chassis to support their suspension/drivetrain design, and body/door mounting method. There is no standard.
And obviously none are keen on seeing their intellectual
property shared with the masses (at any price).

As to whether any "home" builder offers a spaceframe
chassis drawing, I'm not aware of anyone....but maybe
someone out there does.

Legallity aside, I assume you could probably find
someone building an RF or Tornado or DRB or ? who would
take a few measurements off their chassis...but not sure
that would necessarily help unless you were using same
body/suspension/etc.

MikeD