Re:
Looks like a full XTR '92 group on it so personally I'd value the group with wheels at upto £300 and the FRS Fuselage at £350-£400, or the complete bike somewhere between £500 and £650 depending on size and condition of pivots and shock internals.
It looks great though and I have been after an early Manitou FRS but am warming to the Marin Ti main frame version (it should last a lot longer in use than an early Bradbury frame if you intend to ride an FRS 20 years on).
Good job - and I must admit if I had a TiMega I'd be excited about finishing that too - I love them, and the Alpine Stars is definitely on my 'to do' list, if I ever find one, after a Xizang