So jealous!!
I like the Impala 2 base slightly better as it doesn't have the little step on the hi arch bit to accommodate the fancy green cowl of the Mustang model.
Have you got the original catcher for the Imp 2 or at least a description of what it should look like?
The only two examples of a VC125 mk III I have heard running (and both in 1988 only about a week apart and in the same suburb north of Sydney!!!) had this deep moan to it that set it apart from other Victa 2 strokes ( partly why I am fascinated with them). Has yours got that sound? Does it sputter and pop when it first starts like one did back in early 1988?
EDIT: OMG OMG OMG it even has the white fuel tap!