Looking at your design, I see a concern. Having a walk around layout myself, I would advise you to increase you aisle width to at least 30" if at all possible. ESPECIALLY if you are planning on having multiple operators. A 36-40" aisle is preferred, but not required. Just my $0.02
The design is for a DC "Operator-less" layout and likely the only views will be my wife and I. I will definitely not go below 24 and will shoot for 30". See topic "D&H Rocky Mountain Empire (N-Scale) - Design Stage" (http://www.trainboard.com/grapevine/showthread.php?143407-D-amp-H-Rocky-Mountain-Empire-(N-Scale)-Design-Stage) for more details. Thanks, I am looking for this type of advise...