I changed my mind about using Alan Gibson`s backhead castings as the motor I have used slightly encroaches onto the bottom of the backhead space, so I decided to fabricate my own half backhead that will be seen through the cab side.

It sort of looks LMS`ish.......

The space betwixt drivers and bogies I think will look better with a firebox bottom (nasty affliction for some) It was a bit of a fiddle but I`m pleased with the fit....