witticisms aside, an extra chapter in "Creating Cameo Layouts" devoted to the larger scales would be very useful. For me personally, any layout must have a passenger service, which makes things a lot more difficult. One could quite easily build a cameo layout in 1/12th scale with a couple of live steam deWintons, but reduce that scale to gauge 3 and it can easily feel cramped, even if the passenger service is a BR railbus. Then there are specific problems like the entrance to the fiddle yard; what is often referred to as the mouse hole more resembles a cat flap.
Many are put off upgrading to the larger scales, believing that you need a lot more space, so anything that shows what can be achieved in a back bedroom is always welcome.