Filling as we speak.
Need to get me some sand and start working on the rock now I suppose.
The sump return hole worked out perfect. The skimmer feed hole was something I had to scratch my head on for a bit but I think what I've done will work out. There are two 90's on the suction side, but it's 1.5" pipe for a 3/4" input so hopefully the pump will not notice a perceivable restriction. Gonna find out tonight how well it works once the sump is full enough to do a wet test of the plumbing!!