I don't know what FFR's or any other manufacturer intended when they designed/built their Coupes. Peter Brock has made it very clear HIS intentions was to design/build a modern Coupe utilizing current components that would excel against a modern car. Now because he IS 'Peter Brock' there is no argument as to what's period correct etc. The Brock Coupe is, what it is!
Anybody else building a Coupe is just making a "replica". How's that for some twisted, but accurate, logic!
It may currently carry an SPF name, but it carries Peter's soul as well.