All sounds fun to me on the whole. You know you can never have enough toys. Oh and don't forget you'll need to be adding several more rakes of Bulleids that Hornby don't even make... yet
As for wiring, don't ask me, I know nothing (as Manuel put it).
Wagon wheels, never been a fan even before I was abducted by aliens and returned as a Vegan.
F. Prefect