"MOONMAN
Hauspiper, The siding on the lower right didn't make sense to me. It's a counter clockwise running layout. That would have made it a push-in or engine first. You could figure it out if you really want it that way."
If Mike is looking for some operational variation, leaving the siding in (if there is room) will make it more interesting. If he has an engine with couplers on both ends, the two main lines and the two crossovers would give him a run around capability and allow him to work the siding.