In some ways this is a slightly tongue in cheek question but then again.....
Has anyone ever used shelving such as
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as the baseboard? I'm contemplating building a 4mx4m shed (or maybe 4x5) to house my (HO) layout. I'm already thinking in terms of multiple levels for the layout and it seems to me that shelving systems like this provide stability, strength and ultimately some ability to reconfigure in future. Simply butt them up against on another along the walls of your shed, use the "linking kit" to keep them together and simply build your own links in the corners. They also provide storage for all those extra bitsand pieces you don't know what else to do wit (unless you build a 5 level layout).
The obvious disadvantages relate to scenery. Hardly prototypical but then, at this moment, I'm still in the "big train set" mode! Also, not quite sure how I would attach the ramp to get the trains from one level to another. Maybe take advantage of the need to build connectors at corners to put in a spiral? They also only really provide space for a two track "main line" so other boards will be required for terminii, yards etc.