The bar buss is simply copper bars mounted on an isolated board/panel, where each bar carries a different voltage.
since you'll have 5 dual mobos, you're probably looking at 2500 watts of power (probably less), and on the 5 and 12 volt lines, that's a lot of amps. Now you can use heavy copper wires, if you want, but the busbarr MAY be simpler.
I'd suggest that you read pHaestus' article on using multiple PSUs. Check the main site's page.
A PSU is hot-swappable if you can remove it while everything else stays on. Keep in mind that if you remove one, you still have to have enough power to keep the system running, hence adding an extra one. The connectors are up to you: just make sure you use something that is easy to deal with, and that it can handle the power load.
IBM has a beautiful feature on some of their servers: hot swappable PCI cards: press a button to turn off the card, then remove it. The idea here is similar.
To balance the PSUs, first stick to the same model. Turn them on (see pH's article) then start measuring the voltages. You can tweak those voltages to match.
Alternatively, if you want to get away from doing that, then add 2 extra PSUs to your power subsystem. That way, if the load isn't balanced, at least none of the PSUs will end up running over specs.
Good luck.
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