Nick,
I tried a mock up to see what you would run into on the build. Sorry for the lengthy reply, but I wanted to put out forth what I discovered.
- The biggest issue is the switch complex - the stuff doesn't fit - may have to move one crossover pair up near the farm. The Ross switches are long, compared to GG.
- Using sectional pieces requires a lot of cutting. 1/2 turns to get the gentle loops, fitment cuts for lengths, etc. It may be just as easy to use all GG flex.
- You have to decide for table space if the loop around the pillar is O54 inside and O63 outside or if the O54 outer changes to O42 inside around the pillar. Another reason for all flex.
- The angle for lift bridge area needs to be adjusted and the approaches cut to match the angle. Another reason for all flex.
- GG nor Ross make an O36. Another reason for all flex. This may be a little tight to bend even with the GG. The O42 could be a tough one also.
Your sketch wandered on the end lines.
Here's a snip of the mock up. I sized the drawing as a background image and built within it. You can see by the rulers it's a 17' x 12' space.
It's a nice design and not an easy build. I really think an Atlas sectional with Ross switches would be a lot easier. They have the radius and the fractional curves for what you need. More $, yes. Less time.
Using the sweeper curve around the pillar really saves aisle space. Creates an interesting build challenge.
I used Ross 11° for the cross-overs of the mains to set a 4.5" center rail spacing. I couldn't decide what would work for getting to the O36 r-loops.
It will be a nice layout. Give it some more thought and planning time. It's almost there.
