Again, after much thought, I proposed a further trackplan for consideration to Mr Severs and he very promptly came back with some sound advice. So unless someone can offer any further constructive advice I think the below plan for "stage one", Polbrock engine shed, will be rubber stamped "Approved".
I've drawn the track plan in Templot and to me it feels good. It will offer operational interest for one person to build and operate. It will also be a good stepping stone to continue on to Grogley Junction for the building of rolling stock.
I'm now looking forward to posting about progress on this project and further tweaks on Tredethy Wharf.