It seems to me that there is no correct answer to this one because each height selection comes with its own set of drawbacks and/or compromises.
My first permanent layout constructed by my father (RIP) was 4' x 8' and fully sceniced. Everything of significance was affixed to the board. The layout was hinged along one length and affixed to the wall for fold down. Access was restricted to the opposite length and from either end, not absolutely ideal because of the reach to some points on the layout. The two outer corners had robust folding/lockable support legs. But that put the layout height at 48". I was a squirt, but I managed. We didn't consider a popout, but that would have helped the "reach" issue.
The layout could be pivoted down against the wall for access to the furnace area or for additional basement storage if required.....without dismantling anything. Plus it could be pivoted up at 45+ degrees for access to wiring (basement ceiling height restriction).
Given the weight of the primary layout is not insignificant, I was wondering if anyone has toyed with the idea of adjustable height, either from an adjustable suspension approach (mounted to ceiling supports) or adjustable legs (free standing on the floor). Anyone see a layout with either of these engineering solutions?
Jack