If you are doing a multi level layout and incorporating mountains, hidden trackage and such. If something goes wrong like a derailment. With a solid table it's impossible to reach the next level from underneath. You'll end up having to climb onto the table. I'd cut the roadbed out of plywood and place it on risers screwed to the benchwork. Much to keep level or add grades. As far as buildings. You can actually build everything at the workbench on a piece of plywood precut for the space. A lot of details can be added at the workbench and when complete can be placed on the layout.
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