Sump/fuge for a large cube

[Ruth]

So I am trying to get equipment etc. for a new tank that I will be setting up sometime this year and looking for input on a sump/fuge. It is a 300g 4' X 4' cube with a center overflow. I am wondering if I should get a square fuge built or if I could go with like 2 X 75g tanks and use one as the fuge and one as the sump for equipment and just get them both drilled so that one overflows into the other (somehow). Any suggestions? I do not plan on using a closed loop on this tank initially (see how it goes with 4 6200 Tunzes on a controller). It is an acrylic tank so do have the option of drilling in the future if I am not happy.