Well..dog poo...after ordering all these parts and buying the box and drilling all those holes on the box lid and the 3" port I decided to see how it was going to sit on the machine behind the plastics ..which I had marked to cutting...and there is no fracken way it will set in there and miss the all the frame pieces and not stick out and hit the seat. I tried everywhere...even if I cut the upper loop off of the pipe completely and mounted it straight up there. I can modify the box to be a kind of triangle shape..but then the filter won't fit..Dog gone it. It's looking like either this thing needs to be outside on a snorkel or there needs to be something built in-line underneath.
Well, there's one other thing I can try..cross your fingers.