The drilling doesn't bother me (although it would be by far the largest tank I have ever drilled), but where would you put the actual overflow, and where would you drill the holes? I'm not a fan of putting them on either side since they would be visible, and something across the back would be a beast. I'm assuming the bottom would be tempered, but to be honest I am not sure.
Dave
You can see internal overflows. You can see all overflows. I have a peninsula. I drilled mine on the short side. I'd rather have pipes on the outside that you can see than on the inside (black plastic included) that you can see! I also prefer more real estate in the tank. Corner overflows take up more space.
If you go with the beananimal, read through his guide here His thread was so popular he made a website with the guide.
Here is a pic of my CTC on the short end. A note to anyone reading: Never use mirrors for internal glass. I had to cover the bottom part of the overflow because the fish were attacking the mirror non stop...
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