Thanks for the positive comments. Jam, not sure about colours yet, but part of me wants wasp stripe bufferbeams!

Progress has slowed, but as I'm trying to utilise as much of the kit parts as possible I decided to fabricate a 'thing' for the top of the bonnet from one of the kit's buffers and attempted to make an exhaust stack from one of the plastic axles. Not sure about this though because, although successful, it doesn't look right when viewed as part of the model itself.

Oh well, back to the drawing board...