Here are some pics of mine, its pretty simple. I have the RO reservoir up on a small table so I can gravity feed the sump and not have to use a pump.
I just use a rubbermaid tub, it holds about 10-12 gallons and the john guest fitting is an inch or so above the bottom.
I just drilled a hole in the rubbermaid with a drill. I made the hole a bit smaller than the JG fitting so it would be a nice snug fit and then siliconed around it:
A friend built a bracket for me so that I wouldn't have to drill the sump and it works nicely.
I have the level set up so that if the power goes out and the tank empties somewhat and the skimmer as well, the sump won't overflow.
Hope that helps
