If you intend to handle the layout alot (which is likely due to the portabilty), you may want to use a little ply (general model shops that supply boat and aeroplane modellers will have better and thinner stuff than your local DIY centre) or timber on areas that might get knocked (foamboard doesn't take imacts too well, despite being strong in other areas) or handled.
The foamboard I used used in the mag feature was from ex display boards.
The pic below shows the 3mm ply facia along the front. The curved backscene is 3mm ply too. The darker areas on the top are cork floor tiles which are just cosmetic to raise the track slightly and to allow a surface I can set the buildings into. Of course, foamboard would be just as good, just I'd run out and had the tiles to hand.
I am in Aus but i dont see it being to different there...
We use foam in the construction industry over here so try a construction supply company as formworkers use it to
block out penetrations in concrete panels and slabs..
Hope this works for you
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