[Buzz]

FFR's were generally not the go to choice when originality is a big concern. Though they have the "correct" 90 inch wheelbase, the distinctive body lines had them in similar standing in that regard with the stretch wheelbase cars like the Classic Roadsters, etc.
However - as already stated - FFR is a current, active and thriving manufacturer with a massive base of support from both the manufacturer and the FFR owners community. The cars can be beautifully finished and there is a wealth of knowledge to draw from when building, repairing or maintaining your own car.
On top of that, if you are considering purchasing new, the new MK IV version of their Cobra roadster is far more "correct" looking and distances itself further ahead - originality-wise (and in other ways) - of cars like the Classic Roadster.
In my opinion (and that's all it is), based on your question and other factors, I would go with Factory Five.