I've finished with most of the construction.
wood frame is up
plastic grow bed cut/sized/filled
inflow hose ran to bottom left corner (had to install a small filter to keep expanded clay pellets from getting lodged in my motor/propeller)
bell siphon finished and opchecked (had to install a rock guard to keep pellets from interfering with drainage)
had to send the outflow pipe... or drainage from bell siphon.. in a corckscrew to allow time/space to accumulate the suction require to induce the bell siphon.
sanded and stained. Brought it inside. Hung grow lights above grow bed. planted some lettuce, broccoli, and tomatos.
main concern now is adding a safety/overflow drain just in case something goes wrong. Has the potential to create a huge mess! At the same time.. considering how easy this was to create.. i think that everybody who owns an aquarium should use it to grow their own herbs