I don't have any way to measure power draw unfortunately, that really is something I should invest in...
Space:
It is definitely cramped inside, however there is room where it needs to be! I was really worried about cooling when I was first putting it together, but after it went together, I realized there is actually a decent pocket between the CPU and the PSU fan. I faced the PSU fan towards the CPU to prevent a dead-air space.
CPU:
The temperatures don't get excessively high, with the stock intel HSF the CPU never got above 52C even when playing Battlefield 3 for over 30 minutes, where the CPU was at 100% the entire time. The processor is powerful enough for nearly anything I throw at it, except for when I play Battlefield 3.
Did I mention that I accidentally left a zip-tie uncut, which jammed in the CPU fan? I was amazed to learn that after 15 minutes of web browsing, the CPU was still only at 52C! Without a fan! I think this may be a good candidate for a fan-less system if one wanted to go that route.
Video Cards:
The main problem area I see currently is the HDD is too thick, preventing the video card from having enough room to breathe. The GT220 isn't a very hot card anyway, and due to the CPU bottleneck is not running at 100% the entire time, but it still reaches 74C after a long gaming session. That isn't dangerous by any means, but it is still the hottest thing in the case.
I tried to install a GT240 video card originally, but the 1.5 slot design (not quite dual slot) just wouldn't fit with the HDD installed in the factory mounts. If I had a SSD or a laptop HDD that I could just double-sided tape to the floor of the case, I believe the GT240 would fit without a problem. I have a GT430 on the way as well, I may test fit that too.
Wiring:
This was where things were the most fun for me. I've never been presented with this small of a space, where a SATA cable could actually be in the way of other parts fitting, let alone airflow! I managed to route the HDD SATA cable behind the motherboard, as well as the DVDROM SATA cable was routed between the side panel and the optical device. I managed to cram the PSU cables for those in the same spaces
The extra PSU cables were either slid underneath the USB ports on the bottom front of the case, or just folded between the end of the PSU and the front of the case, making sure to not invade the CPU space.
Noise:
Not sure what is making all the fan noise, but this is definitely far from a silent system. I am thinking it's the GPU being 1/8" from the HDD causing 80+% of the fan noise. If I block the bottom vent near the GPU it silences most of the noise. Still trying to figure out how to fix that without just removing the video card!