Again this is my first try at this.
not sure how helpfull i'll really be
I wanted to see if anyone else had made one so I could steal some ideas.
The pump is located in my sump then hooks to a plastic fitting that has an input for a smaller air hose so I believe it's a 'venturi' style skimmer
Once it leaves the bubble producing fitting, it enters the bottle about 4 or 5 inches from the bottom.
The input pipe enters at an angle so the watter will rotate inside.
The output pipes I placed as low as possible to avoid bubbles leaving. I used 'union' PVC fittings to make attaching the hoses easy.
I used a 2 part marine epoxy to seal all the holes in the bottle.
I wanted to make it so when the pump is turned off, the bottle wouldn't drain, and also to make the watter level in the bottle constant but that's where my plumbing skills need some help.
You should really try making one.
I suppose the hardest part to get would be the venturi fitting
(mine came with the sump I bought a while back).
Otherwise it's pretty straight foreward.
Let me know if you have other questions.