Here are 2 options. There's a bit of a discrepancy with the O-54 switches in SCARM that I'm trying to reconcile. Atlas shows the switch with a 4.5" (?) straight attached and SCARM doesn't, so I'm trying to find out if the extension can be detached. The photos you posted have it attached, so I had to add it in SCARM to get the designs to match. I then expanded the size to 11X11. The Blue tracks in the photo show one way coming off the right-hand spur. The Gold tracks show another way (like your drawing) coming off the left-hand spur and crossing over the right. Obviously, both need more than the addition you drew. Because of the O-54 discrepancy, things don't connect in SCARM using the default tolerances, but should if you decide to built it. I did make a couple of changes. For some reason, the author had 1/4 O45 and 1/2 O-54 curves on the right loops where full curves would have fit, so I added full curves. Even though you can't use it, I included the SCARM file in case someone else wants to play with it.
