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Thanks for replies. In the centre of the base there's a pool of lava/blood/goo. Love the idea of flames to hide a support, but I'm believe my skills with green stuff are insufficient for the task.
.-Even simpler: cut a large foam/polystirende support for the platform, and keep it in place when the terrain is stored. Remove before play. I think that weighing on the stairs just a few hours once in a while should not cause bending.
Or if it is possible to have it in two parts, and just push the parts together for the game - but given the design it may not be possible to do this in a way that is stable.
@Daeothar: not sure magnets would keep this thing together. It's quite heavy.But I have to say it has nice and blocky joints, that would help sustaining it.https://youtu.be/GpGt2XbAKJg?t=336