Does having the res. In the tent affect heat though? I would be worried with it being inside the tent it would raise in temperature .I am in the process of laying out some different layouts for DWC. If you know the foot print It's pretty easy to layout. If you want some help I can do a layuot for you. This program will spit out all the lengths of tube and other information to build it.
This is a 2 bucket layout for my 4 x 4 I was playing with.