I got the engine back in place on the stern, filled it up with fresh fuel and it started first pull!
The tell-tale was peeing water like a good 'un so the water pump is still working. So that's a job done, the engine recommissioned.
Getting the engine out of the cabin also means I have space to climb up in the bows and get the bow roller plate bolted back in place.
With the engine in place I could nip over to Jim's boat. We rafted up and had lunch:
All in all a good day.