Unless you reconfigure things, if you can, you can forget about O72 curves. The Blue tracks are Atlas O72, the Orange O45 and the Green O36. The 2nd photo shows a different configuration where I reduced the width to 36" all around in a horseshoe design. This lets you push things against the walls and still have access to everything except the corners on the left if they're against that wall. You could reduce it further to the 30" configuration in the 3rd photo. I used an Atlas bridge too for the popout/liftup access and you can see it won't fit, but you just need a plywood platform and not a bridge there. Anyway, just some food for thought.