Steve,
The bit I dont get is this; Why not study the car- read as much as you can and draw up the plans yourself, there is enough info scattered through this site for you to do that, but at the end of the day it will always be a replica and only as accurate as your ability to interpret that info into accurate drawings from which to transform sheetmetal into chassis parts. I have looked at some chassis fabricated from original plans etc and while it would be nice to have one purely for just that reason, there are also good reasons to build a simpler version as well.
Should you draw up a set of accurate plans that anyone can use to build a car its pretty obvious that you would have a ready market for them going by the number of enquiries similar to yours. Then you could deal with the litigation etc that might follow when some builder did not weld part A to Part B correctly and has a prang. The homebuilt A/C industry has about four pages of legal mumbo jumbo with all plan sets sold that states that you the constructor shall in no way hold the plans provider ( or their relatives /dependants ) responsible for any errors or omissions & you the constructor assume all responsibility for any incident that the aircraft may be involved in. I would imagine that a similar scenario is behind the lack of public availability of GT40 plansets.There is a common thread to all of those enquiries, they seem to fall on deaf ears ( or perhaps they get lots of pm's from undercover plans purveyers
) Other than that approach some of the outfits that will build you one and dig deep into your money pit and be prepared to wait!
Jac Mac