Alright, some progress pictures. First, this is the door in place. I'm not going to bother trimming it out until I get the tank in place, as I may have to remove it to get the tank in the room. I just stuffed the excess with insulation, and it seems to do well. A little too cool here to really determine if it's adequate, but it seems to be. I do have a few places around the wall (particularly at the baseboard) to work on before I'm perfectly insulated. This picture is from inside the room, and you're seeing the reflection of the tank in the door.
Also, here's the AC. It set it up on that little workbench so that it blows the cold air up higher. Also, I had to remove the thermometer for the thermostat from being clipped into the thermostat, as the thermostat actually warmed up a little (it ran about 3 degrees over ambient, probably due to the ~9 amps running through the relay). I'll build something to be more permanent for the AC unit, probably around the same time I figure out whatever vent fan solution I decide on.
Also, here's the (one portion) of light rack that I bought. All told, it only cost about $40 to get it to my house, including all the cuts. I'll need more than 3 times this amount for my light rack design, but it's a good starting process. I actually assembled it once, then had to get the mallet out to get it apart, as it was rather snug. But I wanted to see if I could get it apart. Obviously I can, but I won't plan on doing so again, as it wasnt easy.
If you look close, and I'll get more pictures of this later, I bought the end connectors so that they'll stick down and act as feet to keep the rack off the floor and keep the LEDs from ever being crushed. The idea is to stick 3 LEDs on each piece of aluminum, evenly spaced, so that I've got 12 LEDs per pendant. I think that will suffice, but I won't be certain until I get this built up. Here's just a quick shot of an LED on the aluminum. I was surprised how small the LEDs were.