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Good technique tips. I build mostly with LEGO - reusable parts. But whenever I am doing anything that involves cutting or modifying or gluing or drilling... I go watch a bunch of yubie-tubie videos, and learn how to do it well, before I even try. :-)
I made almost the same thing, a decade ago, to make soap! With minor variations, this same idea/setup can be used to make a rack of soap moulds. My first wife and I were do-it-yourself soap makers - and this is great for making melt-and-pour soap!