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Having varied my eBay search terms slightly, I've now come across some designs I seem to have missed before - and also this time avoided the tower building games I was confronted with earlier - and have just purchased a compact, collapsible or fold-out tower of simple but apparently robust design in 3.3 mm MDF, for £7 with free postage. All that's lacking is the felt to line the tray and baffles, which I will look for shortly.Thanks again to everyone who responded for their comments & suggestions.
Quite like the idea of dice towers but only if they were available as a convincing terrain piece such as a building that could be used across a number of historical periods.
I prefer this ancient Roman One.... Davide