Nice, a decent rack is quite expensive so getting one for free is always nice 
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That mixer is probably worthless, even if it’s still functional I haven’t heard much good about peavey mixers.
Yeah that’s pretty neat. Does it have some sort of ventilation? Putting 3 pc’s next to eachother running a bunch of plugins can get hot.
So you did, must’ve skipped the bottom part of that post
Something else you may need to consider is humidity, you may need to dry that air (chemical drying agent - like the crystal or beads you find in packaging sometimes) before pumping it into your gear!
Actually, it’s about 5 feet and change underneath the ground, if you don’t mind doing a bit of excavation.