The smokebox has the option of superheated (long) or saturated (short), as I am building the kit as superheated the wrappers are left whole, a strip needs to be cut off for the saturated version. The smokebox front and back each have a tab at the top and the inner wrapper (seen in photo) has slots in it to locate them, this went a lot better than I expected. The outer wrapper is sweated over this and has no slots.
The boiler has a number of tabs at each end, these fit into slots in the smokebox and cab. Quite a lot of material had to be removed from the boiler to clear the wheels in 00. Still quite a bit to do to the boiler.
Wheels, motor and gearbox fitted and it runs very smoothly. I've never built anything with wheels this big before and they seemed a bit daunting at first (there's only a few locos with wheels bigger than these), but the seem to have gone on really well.