Most accurate Diablo replica was crp, aka Steve Curtis, next would be the naerc bodies however getting either will still set you back 10-15 g's.
The DnR body was great for the quality and parts that came with. Tom @ total performance is still building kits. Cliffs oem body was splashed from a crp body.
When looking for a kit I would shy away from the cheaper versions out there. The devil is in the details, make sure oem glass or aftermarket glass is available. Areas to look for accuracy IMO, door jambs, windshield area, front and rear bumpers, quarter window pocket, tailight Bezel area. Correct roof rack (d n r cars do not have the correct windshield angke)