nicely done!!
iv been looking at building one myself.. i really want to get rid of my tank hung skimmer, shes not pulling like i want it too...mostly yellow water instead of a good thick milkshake of nastyness..lol.. though right now i do not have a big tank load. ild just really like to have a nice clean look to the tank. good way to get rid of heaters and such as well. besides i like to tinker
of course i do not have a pre-drilled tank so il be useing an over the top syphon system. the drawback being if the syphon stops the tank overflows as the return pump doesnt know anything is wrong. i think i can cure this by putting a fire sprinkler tamper switch into the sump feed line. should the water cavitate or stop completely il have it tied to a momentary relay to control the return pump. if the water by chance starts to flow by itself again the switch will prove a flow and turn the pump back on