"Man at B&Q"
I willing to bet that you are more likely to suffer injury lifting a heavy baseboard than from any of the processing involved in making it.
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Here in North America we never lift a heavy baseboard. Once our benchwork is built, it's never moved as 99.9% of our "scale" (Vs toy train) model railways are "permanent". We build the benchwork first, that's the legs and benchwork framing out of 1x3 or 1 x 4 lumber and then we cut the subroadbed, either 1/2" or 3/4" (better) plywood cut to the shape of the track plan. Chipboard, MDF, and all other compressed wood products are strongly discouraged in North America. For single track this subroadbed will be about three to 31/2" wide and will be widened for passing sidings (loops). Even in a "town", the chances are that much of the track will still be built on a subroadbed rather than a flat sheet of ply. If the plan calls for private spurs (sidings) they will also be cut only wide enough for the track, 3 to 31/2".
Once we've cut the subroadbed, we'll attach risers to the benchwork framing, using the off cuts from the 1x3 or 1 x 4 lumber, to raise the subroadbed up to the height above the benchwork framing that we desire, anywhere from 3" to well over a foot in some cases. Then we add the roadbed usually made from a 1/2 think product, equivalent to your Sundeala and then lay track, add wiring, scenery etc., etc.. As I wrote before, we don't use solid baseboard like in the UK except under multi-track yards.