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Why not around the walls?
I can't read the dimension numbers alongside the benchwork, but I assume those are 1 foot squares, so the benchwork is about 36" deep. That means your bigger "turn-around" curves are something like 15-16" radius? Since you are putting the whole thing out in the middle of the room and allowing human access from all sides (very handy for that yard that's in the corner!), I'd make the two legs of the "L" wider to allow for broader curves. What the heck? You've got the room, and there's no "reach" problem. You may only be thinking about short 4-axle diesels now, but who knows what you'll run in the future.
Will there be any backdrop down the middle of the layout separating one side from the other?
On my HOn30 layout it is just about impossible to take a photo of that curved trestle without getting the back ground in the way. I was thinking if this was around the walls that trestle would be in a corner and much better to photograph.But I have a breaker box in my way... in fact here is a pic of that trestle with the breaker box lurking:https://photos.app.goo.gl/3DMb9b3UEeGSYLXe6Previously I had built out around the box so I could still stand up behind a backdrop and get to the breakers, but it took up a lot of space. This was an old plan for a layout. In the lower right that triangle was the space for the breaker box:https://photos.app.goo.gl/vnHKmkCM88beHyRm9It would be great if I could just snap my fingers and lower the box about 3 feet, but that is a lot of wires to move and probably very expensive.