Or it could go this way

This way it would fit with the plan against the layout frame and the switch area could hang just below it with the controller beside it on a shelf. This would be compact and tidy and not too obtrusive. I've printed this out and put the switches in their correct place and they all fit, it will be a bit of a rats nest but if I make a big effort to keep it tidy all will be well.

In the great plan St Ruth is directly above Port Lucy, the other terminus of the railway so I can't have too many dangly bits... ooh er missus.