Okay, so here is a pic that I developed using Google SketchUp... not perfect, but it could work.
Simple enough... slotted front side, 12" wide, 3.5 inches tall (the box itself), 2.5" deep. Two pieces (blue and yellow). Blue hangs over side, and yellow hangs over blue to hold it snugly in place.
Back side has 1" drainpipe. Will have two mounted siphon tubes, one on each end. Siphon tubes will have a small valve on top (can open valve, suck out air, and siphon is started?). Two tubes means I can get a few bubbles in one or the other, without losing the entire siphon.
Thoughts, comments, suggestions, etc?
-Lee