G,
Very nice model, good isn't he.
Yes, there is an easy way. The texs for the livery are on the DB7_01.bmp tex, just over paint them or add/remove livery etc...see attached pic below..
There is a simple VC in the model. With a bit of hex editing of the mdl it can be displayed, also the eye viewpoint needs to be adjusted in the aircraft.cfg.
The only very slight issue is that the tex for the drop tanks are the same as the props, so black really is the only option, or have the props and drop tanks PR blue(!). In the real world the PR aircraft almost always used drop tanks (of varying capacities), and they would have been painted PR blue. But I have seen the early nightfighter black drop tanks being used on PR Mossies, so not completely out of the question.
There is a way of scasming this but..........
I've attached the modded mdl, aircraft.cfg and .bmp, so just replace the orginals with these.
Cheers
Shessi