well, I dont have a DIY link for the corner overflow, but it should be pretty simple. Just two pieces of acrylic that are the same height as your tank. I'd make one piece about 5-6 inches wide and one piece about 3-4 inches wides.
Silicone it to the tank, dremel out some strainer holes and get it drilled...
Maybe someone else has better info for you tho.
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