Oh looky looky, Hi June did sll my talk about hill stream tanks and setups mske ya want one ?
Google Oliver knots hill stream tank that thing is a masterpiece.
Personally I wouldn't use an in tank sump id have one underneath to allow more length. I would also setup an HMF filter on one side.
The hill stream tanks for me give me the opportunity to make my own aquarium and if you have ever wanted to try your hands on making your own tank this type would be the best as you are after length and width and not so much height.
Keep in mind that these tanks are usually louder then regular ones because of the flow rate and setup.
Sorry I have been away just been busy working chasing the big oil money in Alberta Canada