How wide is your aisle? It looks very narrow. I wouldn't go too narrow there. You won't be happy. I might run a single track along the 24' wall to a wider yard on the 13' side to maximize the use of the narrower portion.
I would also consider a double track with this much space (Is it 3 rail?) Lovely to have two trains running at the same time with no worries of collision. What size are your curves? O72? They look at least that big.
Ideally you figure out the benchwork and then tweak the track plan with actual switches and track. They also make (or used to make before CAD) plastic templates for track sections and switches if you can find some of those. Your switches look like they might not be to scale.
Expect some of the layout guys here to post complete plans for you. Armchair layout planning is a hobby in itself, lol.
