The rear shot shows the white plastic-card surfaces where the composite spare parts-did not quite stretch or cover enough (see below, though it has to be said working with „old brittle plastic“ from the 1970’s or 1980’s is a curse as it had a tendency to crumble or splinter under pressure – this was a peculiar challenge for me as I had to first disassemble the previous attempt at building it [basically a carcass] and reassemble it [from a haphazard trapezoid to a more regular rectangular cross section]): 

The Lee part of the tale is just a turret swap with a newly completed Lee turret (see below, this was taken from the „original“ orange/brown plastic kit – where the majority of „kit“ came from- again care being taken with its brittleness): 

The final note is that the track came from the „spare“ more detailed option in the new Airfix Sherman Firefly kit I have already made. There you go, I have one more tank to fight the Axis with. It just shows the usefulness of a spares box.