I have to confess i took the easy road and ordered a pre machined cylinder and end caps and a new unmachined base from Stuart Models. I feel the shame of tasking the easy road and throwing money at the project instead of using skill and determination but i could not think of a simple way to fix all those out of line holes properly. As they are so close to where the proper holes should be any 'filler' material that was softer than the casting would cause the drill to follow the line of least resistance and i would have a worse mess

I also ordered some thick aluminium sheet and oak for the base and side panels, still haven't really decided how to do the base yet, maybe a full sized base and a raised deck surrounding the engine?
Stuart Models have already dispatched the drawings, screws and first lot of parts, how quick is that, awesome!
Thanks for following
Ade