Ahh this is interesting Mark. Yes, I am also looking at using 2nd & 3rd radius. I was hoping to get away with 2' wide for the boards, as I'm planning a busy off the beaton track branch line, with maybe a couple of CE sidings. It's rear storage I need more than anything so plenty of stock can be run. I shall continue my planning.
Keep up the great work.
Cheers, Anthony