I just read this whole thread.  Amazing, thanks for all the replies to everyones questions.  I have read a few things about drip systems and I think you would just have to incorporate an overflow from the sump to the drain system in the floor.  The extra water from the drip should exit there, not from the tank itself.  I'm also planning a build similar to yours except I will be attempting two side windows, with plywood only for the bottom, back and top.  Do you think that would be pushing it?  Mine will only be 24" high with 1/2" acryllic or 3/8" glass.
Anyway, congratulations on your build.