I left several openings for ventilation using windows, there are standoffs holding the board about 1/2" above the lego floor. The big Noctua spins quietly with a resistor. https://cdn.discordapp.com/attachments/1179360051442487427/1553454123117060237/image.png?ex=6ab94e64&is=6ab7fce4&hm=1276ad4e54ce072eabbcccb8cd0072c24576d80b840f5662991894bcbd564588& https://cdn.discordapp.com/attachments/1179360051442487427/1553454123683156138/image.png?ex=6ab94e64&is=6ab7fce4&hm=da94930d1db7f9bf7ef3b59dfc70c25339b5e78a49e11e3e47aba900cc025d2d&