John, that's a good attempt, but the "S" curve should be avoided and the tracks across the opening appear to be too close, but that will be determined by your bridges. There is a 2nd "S" curve to the left, but it's smoother and might be okay.
Anyway, I cut an O42 curve in half (close anyway) and inserted a straight to avoid the"S", then lined everything up to close the loop. One thing to avoid is using too many flex tracks and bending them too tight. I don't know what size curves your equipment is or will be rated for, but that flex is awfully close to O32. Even though my equipment is rated for O31, I use O36 for a minimum. When designing, I try to get close with as large of curves as possible, then I either cut them or delete them and close the gap with a flex. That way I know it won't end up being too tight.
z
