I'm not sure what a beananimal overflow is but the center 1" hole is the drain line, it will have a PVC 90 fitting creating the siphon. The 2 3/4" are the return lines which will be lock line up and over the sides of the overflow..
As for having it a 4 sided complete box. That really doesn't make good sense. If you do the silicone correctly no one will ever see the silicone bead. I am by no means a silicone expert but with the instructions from Discoreefrover and Melv I think I can handle it... Pictures to come...
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