Hi Tony,
Great to hear your putting together a 1/12 Testa Rossa project to follow up your awesome Autograph F40. By coincidence, a friend and I were just discussing the MG Testarossa kit. He mentioned he was planning to purchase the Autograph 250 GTO engine for it because it and the TR engine are almost identical. THAT would be an incredible project and you already know a lot about Uli's way: (soldering watch screws to photo-etch and that kind of thing).
Anyone that hasn't seen Autograph models should check it out. Here's a link to their site:
http://www.autographmodel.com/Englisch/Englisch.htm