Nice build, you really have taken a lot of time to think this build out the right way. I have the same skimmer you have and I hate the noise it puts out. How did you get that coupler piece for the outlet? Did you just call them and ask for the part? I don't have that piece with my skimmer.
I was just looking at the same thing... what size is the coupler? 40mm OD to 1 1/4 OD? I cant find it on their web site but there are others online. Need to be sure of the size though...