Bill,
The "skyboard", or backboard is the same for 30" as for 24", and the mod's are usually carried "front high" through doors, so there's really no more problem,,,,except for the extra weight.
There is an N scale group in this area, and one of their members has a "module" that is a self contained "layout" featuring the Edmond Fitzgerald, and a complete ore dock and waterfront scene. If it shows up at the mall this weekend, I'll try to get some decent pics.
Pete