I have had a GTD since 1990 now so have skin in the game! GTD made approximately 400 chassis/cars. They supplied comprehensive kits if you bought the full kit down to the last self tapping screw. Stopped production a long time back, bit of a messy and sad end to a good product. The car has a space frame chassis and the body was authentic looking. Check out Trevor Legate's GT40 book. There is a chapter in there on replicas plus the cover picture is of Robin Batts GTD! More GTD shots inside. No idea why he did not use an original car for the cover shot but there you go, the GTD shape is sufficiently authentic enough for that use. Southern GT used the same body as GTD but now AK have the Southern GT brand I think they are making their own bodies going forward, but check that with Neil at AK. A good number of owners tracked their GTD. I rarely saw any other GT40 replica brand on track (UK) when I used to track my car and when you did they were much slower by comparison. My opinion is that the GTD is now second only to AK/Southern GT as a tube frame chassis but was the best, and the benchmark, for many years prior to Southern GT coming to the market. Others will obviously have their own opinions! You could upgrade the GTD chassis to part Southern GT spec at the rear and there are many other standardised upgrades you could do to GTD to personalise or improve the performance.
If your contact has enough stuff to form another GTD then that would be a worthwhile project.
