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Growing up poor, I had some knock-off Playmobil and knock-off Lego Duplo. Fortunately they were high qualit knock-offs and Duplo and Playmobil worked together very well scale-wise. Also, Duplo KO sets used a greater variety of parts compared to originals. I found about this when I tried to find out the original sets years later, Duplo had never produced sets that complicated. Anyway, I had several Duplo base-plates and I attached them to top of a cardboard box with those bigger, thicker rubber bands. Thus, I could build top of the box and used the box as a cargo area. Sometimes it was a ship, sometimes it was a castle with a huge dungeon.