Ted,
Welcome.
BTW, it is the OVERFLOW that runs along the back of the tank, NOT the sump. You mentioned that twice here............figured it was a ghost in the machine..
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Running the sump all along the back is an interesting idea. I did find one example on the internet of a sump in the middle of the back.
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The sump should be under the tank or off to the side somewhere............
I have seen the type you mention as well at the LFS. A double drain is also nice.........With 24" of skimming, will do a great job!
Did they have the returns come up through here with the example you saw?
Are you going to DIY? If so, please post steps and pics!
good luck.