after a little more playing about with track and photo copies of points i have reached a stage where i think i have a workable plan for the extension of the sidings to allow a loco to shunt wagons.
mock up on the kitchen floor to prove the theory, but the use of two 3 way points may be a bit over the top?
i may allow for 2 more sidings and have another try before fixing to any wood.
i also need to check the length of my longest wagons and locos to make sure i can fit them onto the yard.
I do think this is looking a bit straight and could do with a gentle curve.
it will need a hard standing area too.