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A hollow core door would be much more rigid than a 1x3 frame of the same size.Also with the door, you don't have to make joints, and a door won't warp like most 1x3 solid lumber today will.Ed
I actually have noted some minor sagging in my hollow-core door layout as it nears its fourth year of existence. It's enough that free-rolling equipment is difficult to keep in one place when spotted on a siding.
I had covered my door in 2" foam, which then introduces a host of other under-the-table mounting issues, but my plan for the current project is to route in holes and then place a thin sheet of plywood on top to provide a mounting base.
Just put an open grid of 1x4s on top of the door and foam and lay 1/2" ply on top of that for the subroadbed. That will give you plenty of room for the switch machines and all the wiring.Jason