Yes it's a pity that Des has stopped blogging. I learned from another Ford forum construction is under way for a GT90 kit. Exciting news despite my concerns about getting such a car road legal.
I recently discovered the real GT90 is owned by the Hajek museum in Ames Oklahoma and that the above mentioned video was shot there.
Here is a blog I found about someone finding the GT90 in that museum: NewGuy: 6 Day Road Rally on the Roadkill Crew
For anyone living in Oklahoma, the GT90 will be on show at the OKC Auto Show March 4-6: The OKC Auto Show
Darn I wished I lived there.