My layout is pretty similar in its dimensions as yours. Maybe you find it inspiring...
I used two "TrixBrix compact corners" and enhanced them a bit with additional "R40 Curved 45deg switches" into a rail-yard.
Bottom curves are R56 (inner) and R72 (outer).
The very top rail has R88 curves.
Single-crossover switches are R104.
All parts are TrixBrix.