Any pictures? And do you know about what it cost you to build? I was about to build some 1 foot extension cords but it would've cost me way more than to just buy them, so I am just curious about your build. I will be automating another one of my aquariums and would be interested in using this idea if feasible.Why not build one? You can make a power board with outlets and timers from supplies at any Home Depot. You can also have a master kill switch for filters/heaters as well as a second MAIN switch if you needed to fully de-energize the tank.
I did that with my tank and I love it for the convenience when I do water changes. Flip one switch and shut down all filters/heaters while leaving the lights on.