Liquid cooling.
Now liquid cooling is not a bad option. Very small radiator inside case and circulate fan air somehow from side to side. The liquid could be 0W-40 motor oil and pump could be some tiny 24 V fuel pump. Why oil and not glycol water? Well, I just like to keep them separate if possible from 230 AC.
I seem to like 24 and 48 VDC stuff. Industrial legos are quite fun to do projects with. I thought that small heating pad from truck mirror could bring the machine always to normal operating temperature. Yeah I'm also thinking of possibly using this in freezing cold and getting rid of moisture.
For sealing the front I haven't yet figured any good solution. Maybe just pour thin silicone layer on top of everything. I already have dedicated pelican case for this and ready to be modded.