A:AnswerYou'll need to buy an HDMI-to-display port converter so you can plug it in directly to the GPU. Or, there may be a setting that's keeping all the visuals required to be ran through the GPU, and it can probably be changed in BIOS or something, not sure.
A:AnswerI'm able to use my Valve Index with no problems so you should be able to use a quest as long as you have a USB-C 3.0 cable or airlink (usb connection is better and more stable)
A:AnswerThere's an additional M.2 slot for another SSD. I'm not sure what "standard" means. There's definitely a lot of extra room/space in the case, but I'm not sure if the motherboard has the connections you need.
A:AnswerNot yet, but I did see another person say upgrade it to a Gold Rated PSU, I've looked up this PSU and it is gold rated so it probably won't short circuit the PC.