Ed
To the best of my knowledge you won't find any build sites
for a Fiero based GT40. Reason being they don't make
good donors for an "authentic" looking GT40.
Check out V-8 Archie's website to see how much work he had
to put into a Fiero to get his replica to look decent,
and even his varies a lot from the tube frame kits
(sideways engine for example).
If you want to see a nice Fiero build site, visit
the Lambolounge.com for Rick's (?) great story.
But if you want a seriously nice GT40 replica,
a tube frame kit is the way to go.
MikeD