Yes, its possible without drilling it. Not sure why you would want to do it that way as it introduces un-needed complexity but you can do it. KISS - Keep It Simple Silly.
there is nothing done to the tank.... i might have to cut the hod a little but u wont be able to see haha
...... is the a vid on how to make an overlow
You are better off drilling holes and putting bulkheads in it though. Depending on what the tank is made of. The only way I would try to run an overflow box on a tank that small is if I flat couldn't drill it. Otherwise, it would get drilled.
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