Look into how folks design for shows;
module layouts- some can even be assembled with modules in different positions. They bolt or clamp together, busses with plugs carry power, legs fold up flat, terminal strips, fahnstock or "speaker push terminals" for accessories that need to come off for transport. Holes/wells fopr poles, etc.etc
The car, loco, sets and their carry cases are interesting too.
It doesn't cut the bulk much , but it does make it far more portable.