Hi Mark, I hope your knees start feeling better! Above is a layout posted on the forum by ACE to give you some fresh ideas in a very similar design arrangement as yours even though this is in 027+. Obviously, the yard in the top right wont work in your space, but you could perhaps move the yard to a subterranian level underneath your bottom loop by the window and door.
The design and planning process is half (give or take) the fun of the hobby. I'm sure you will come up with a great design while saving your knees and back!
JD
