Hello!
I have a few friends who have built DC and Parallel Diablos. My first thing to say would be to make sure you have driven one. My all time favourite car was/is the Diablo but I found I don't fit and can't drive it! I'm 6'1/6'2 ish and my head was squished on the roof.
The VT Roadster my friend had was a little better though (with roof closed), but have a sit and make sure!
Look forward to seeing your updates when you start a build thread