Can you drill a Sephora tank?

[geko522]

Can you drill 120 gallon Sephora rimmed tank? I don't like the one with the Corner overflow. It looks uneven with only one. So I got a good price on 120 gallon Sephora aquarium tank. I want to drill it for an overflow and a return for my sump. Does anybody know if that's possible or has done it, also do you know the thickness of the glass?

 

[Reefing_addiction]

Need to determine if the glass you want to drill is tempered