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Building my own 45U open frame server rack! The frame will be made out of 4040 extrusion, this is actually my second rack. The first is all covered up in the background, since I (temporarily) ran out of budget for that project — that one is "work" related while this one is for personal use.
If you want to do something like this, keep in mind that these rails are actually slightly taller than 45U — the double rails are a few mm longer, and the regular rails are twice as much. Buy the rails first, measure them, then buy the extrusion. Maybe I'll make a build log out of this one.
These are from Penn Elcom on Amazon, the double rails will be in the front and the other two in the rear. I probably should've gotten double rails for all four corners since it was like just Rs 100 more per rail. I'm assuming the double rails help with rigidity when mounting equipment that don't extend all the way back and instead have extra mounting points on the sides behind the ears. Or maybe they're for 0U PDU's?
I've never even seen a server rack in person so this is all very exciting for me, I'm loving the high-quality matte black power coating on these — most rack owners probably don't say things like that, haha.