The curves are not costing you any space. There is 8" on the west and the NE wall, the alcove, the corners if you don't round the table, 17' x 9" in the SE.
You have your choice of what extra track and radius if you want something inside the mains.
When the plan is done, you'll need about 80 + pieces of flex track to build it, plus switches and specials.
Just the two mains need are 80pieces to build as shown. The sectionals are only there to identify the curve. I get an exact count when they are converted to flex. 245' feet of track.
The water clears by 3.5" and 5" higher where the e is in slope on the track plan. Sounds like a mountain.
Do you want to cross the opening or create an r-loop in the SE to East?
You could a point-to-point with a r-loop in the center and run that line next to main in the N. The inside main could switch on and off of it. That could be the branch line to service freight or passenger and connect to a yard or something like that.
I'll wait while you ponder. Thought the pdf would work on mobile.
