Despite not having printed out the layout plans, I can, using the powers of a tape measure, start to work out what can stay and what can go on the layout.
To recap, the boards that I inherited had the fiddle yard to the LHS whereas I’m having it on the RHS. The original RH end of the board was a terminating station whereas now it’s going to be a through station.
I therefore measured out and marked the old platform and removed the excess. In reality I think much of the original platform will be discarded as I want stone (slate) facing and the original top has sagged so I’ll replace with plywood.
However this current cut allows me to work out the rest of the track plan.