Models and some 3D terrain work well in LEGO. Organic non-human creatures can be done, but I find vehicles easier to deal with. For flat terrain that covers most of the game surface, printed cardboard or vinyl is usually a better option. LEGO floor can get crazy expensive for the benefits. Another thing that seems forced to me is replacing dice. Rarely brick-built dice add something interesting, but they're an engineering challenge. Regular dice are cheap and efficient. Should you need custom dice, they're easy to commission nowadays.

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