I have seen a couple of Tribute cars recently. One was a 275GT (coupe body) at Knebworth. Dreadful. Panel gaps, at best, variable from correct to about 16mm. Panels wavy.
The second was a 250GT Coupe at the Manchester show. Fantastic. Panel gaps as good as DNAs. Not a ripple anywhere. Still had the Z3 dash but had bespoke luggage.
Presumably it's, as usual down to the builder.
I'm a bit biased as I judge kit cars by the DNA standard, so if the 275 is your car I'm sorry but it didn't compare with the one from Manchester.