For what it’s worth, be mindful of the space adjacent to the power module. You can only place very shallow modules within 4 hp or so of that location, with the Quad Envelope manual saying it is 26mm deep (not counting connector placement, which can create problems even for the most shallow of modules there.)

This is definitely one of the things I’m least happy with regarding the Rackbrute, along with its angle adjustment being more limited than you’d assume (and actually more limited than what is shown in the manual!) :/
-- mvdirty

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