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What I would go for were I designing this eGPU enclosure would be a thick wrap around bezel like on the S4 that both the AC-DC and DC-DC unit can heatsink onto. From there, you can easily put on two side panels and a back panel that can mount to said bezel. Could have ample ventilation and the heat sinking onto the bulkier outer frame of the enclosure would likely keep the thermals of the power system under control.