great build!!! im building the same size tank as well! i decided to get a APC backup after seeing your setup.
i was looking to plug in my airpumps, koralia powerhead to it and perhaps keep a spare heater around just incase.
Made the lid in four pieces. It's like that so we can open the top all the way without it hitting the ceiling. I figured no need to paint the top of the lids because you can't see it and it shouldn't get wet.