I have been waiting to drill the holes for the water fill and electric cord until I could borrow a 3-1/2" hole saw and today I did, dark and snowing I put on my LED headlight to drill away so I could return it tomorrow. I did take time to reflect what was wrong with me as snow flakes fell down my back as I drilled the holes (no court has been able to prove anything by the way) but I attributed it to be a good friend that wanted to return the drill as promised... The mark-out. Holes drilled and everything in for a test fit, Water, electric cord, battery vent and a exterior outlet below. I didn't install anything as it is in the 20's and didn't want to caulk anything.