Roof case panel or door side panel? either way works given the right planning, door would be more cumbersome though imo, roofs a non-moving option.
mounted on the door you would probably be best having a fair bit of slack in the tubing and I would recommend quick disconnectors for that as well, just in the event the door has to come off for new gfx cards etc
there is always a way as long as the builder is open to ideas and modding
anyhow, bedtime for me, I'll look in later though
*Edit, the carbide 500 has homed some nice builds,