OK, a couple of hours with the low melt solder has seen the Duke back in one (heavy) lump. I soldered the boiler assembly to the footplate in the end and have filled the gaps around the cab etc with solder. The Crownline detailing kit has been raided for the blower and tunnel as well as the top feeds and pipework.
Just got the pipework around the cab/firebox are to sort now. Will use one of the Crownline castings to represent the blower valve and make the rest up from copper wire. The injector feed valves will be my usual wire insulation with a tiny hole drilled in for the operating rod.
Shouldn't be long before a good clean up and primer