Modding and quiet potential ...that's a nice combo'
All those paint samples looked pretty good. The top one appeared to have the most consistent finish, but I prefered the other two colours :)
You could use a lot of auto-type parts in a project like this, given the dimensions.
For example, you could not only watercool, but could replace practically the whole rearside door with a humungous low profile radiator to have almost passive cooling potential ...then use a huge, low profile, low rev fan to move just enough air to do the job :D
I'd probably never look at a fan anywhere else on that monster that was less than 120mm it's so big ..and hence the bonus of using bigger, slower fans.
When you get it, take a laptop, a paper, and a nice comfy chair and sit inside it during a quiet time, I'm sure the relaxation and the intimate surroundings will prompt further ideas :D
Good luck ...great potential ...and the house extension to home it would make a nice follow-up feature ...LOL, couldn't resist.
