It's a Prova body shell. It will be turn key only build to spec by Regal Classics. The guy behind Regal is incredibly into detail - he built the quad turbo V12 orange Diablo. Besides owning the Prova molds he also owns DC Supercars Diablo bodies as well as Mirage Countach. He likes his Italians!
The floorpan underneath there is.....a Boxster. No chassis mods, no IVA but not sure how that works with windscreen but anyway. 3.2S turnkey starts at £55k
http://www.regalclassics.co.uk/
And award for best combined paint/bodywork on a Tribute goes to..... Hurnleft!
Bobs car may buck the replica slave trend but the paint finish taken in combination with the straightness of panels - that's the one to beat.