DZ, I am not so sure that the FAA Museum's FRS1 is a "cobbled up fake". I must admit that i thought that at least 1 FRS1 had remained in that configuration at Boscombe Down or with BAE for some reason & never converted. Why would anyone go to the trouble & expense of faking the early version?
The Yeovilton 'Sea Harrier' is mostly a GR3 ,with a Shar nose grafted on (at Dunsfold)...purely from memory the Shar was lifted from the sea (Adriatic) and was in quite a state !!
The 2 airframes are basically the same dimensions aft of the cockpit,so a reasonable representation I think.
All surviving FRS 1's were updated to FU2's
cheers LR