New update, for the few that care to read.
I swapped the chair for one of those mesh chairs and it was a huge improvement. I managed to get it on sale without even trying. I tried those special wheels that @Hyperstrike likes, but had to take them back off because of what dad's old setup did to the carpet. I kept rolling Away from the bloody desk! >.<
After a couple weeks of BS (I HATE FedEx), I finally got the new AC put it (today actually). Because this house sucks, I had to remove the added carpentry (needed to keep it in the window) that was moisture exposed and replace it with new stuff (I wrapped in special tape before mounting). That was Loads of fun seeing as how I only have a jigsaw and needed to cut the 2x4's in half amongst other things. Took me two days as my chronic fatigue does not like it nor the heat it seems. I can't wait for central air again. X.X
I got the iMac connected to my monitors now and it's going to help a ton. I've yet to trip the breaker running that on the same outlet as the network, but I'm still planning on trying to add an outlet and network junction (plug the router Out and distribute from that). I really don't like this contract though, so when I get the energy for it, I'll probably look for something else again. That will likely cause me to change companies though, which sucks because, like Iron Man's GF, I hate job hunting.
Still more to go in the room, but I think I may switch to redoing my bedroom closet first so that it's more functional.