so i finished my design and printed it, fits a 80x80x10 mm fan (i got myself a 5v one), the air vents are the same as stock, fits the stock screws plus 4 heatsunk insert to fix the fan and 2 extra m3 nuts to eventually mount the unit on the wall or something.
obviously no vesa mount possibile, can be printed in whatever material (i printed in abs) without any support just as it is.. on the other externa facing side there are 4 slots to place the original rubber feets.
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a 10mm fan clears every internal component, probably a 15mm also but not sure, temps are "fine" and the enclosure is nice and fresh.
inside the zip is the stl to slice it, as said no supports needed, 10-20% infill is more than enough.