Welcome to the Gnut house.
Been looking at your proposed layout plan and as you asked for some help .... well here goes.
I have taken the liberty of modifying your track plan a little.
There is one extra point but I think it might be a bit easier to work.
I noticed that in your original plan all the points pointed in the same direction.
This seemed to me to produce a layout that would be very difficult to work as you could not shunt any wagons into any of the sidings if the train came from the right hand fiddle yard (unless you had a second loco.)
So I have put a passing loop in to allow the loco to change ends. This will also allow two trains to pass each other if you require to do so.
Also in the engine shed area all the points connected to the main line.
I have kept two points off the main line so that you can move the locos around a bit without blocking the the main line.
I trust that you will take this as some constructive advice which I hope makes some sort of sense.
Looking forward to see what your finally plan turns out to be.
Have a good day.