Tony,
When I was talking to Doug at IA, his main concern was putting the overflow in the middle of the back of the tank. His concern was that it could ruin the stability and cause the tank to bow out and potentially break.
Why couldn't you put the external overflow on the back closer to the end of the tank. This may give it more support instead of placing it in the middle, at the back.
His concern with the potential of blockage of the overflow is a concern, however if you made the opening wide enough I don't think it would be a problem.
When I ordered my tank, I met with mitch, who recommended I go with external overflows. I am putting one overflow on each end, so blockage or glass stability shouldn't be a problem.
HTH
Jim
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