Recently setup a 60g cube, 24x24x24. Went to Petco during the $1 a gallon sale and purchased a 20g, which is actually a little more, because it's dimensions are 24x13x16.
Anyways, installed another beananimal system, which the siphon pipe drains straight down into the sump. The sump hangs roughly 1.5-2" out the back of the stand. I didn't want an oversized stand and this small amount of overhang doesn't effect the distance that the tank/stand is out from the wall because the external overflow box is 3" off the back glass anyways. You could always put a small piece of 3/4" ply under the overhang if this makes you uncomfortable.
Simple sump setup, 2 chambers: Drain and skimmer section, through 2 baffles (over/under), and onto the return chamber.
Stand is 24.5x24.5", using 3/4" birch. I have the sump, 2-1.3g containers for Alk and Cal, and will be building an acrylic tipoff container to fit in there also.
Dosing pumps, Apex, and all electronics are under the stand with the exception of the Apex display.
I'll see if I can get some pics of the sump tonight, as well as others.
The sump is out further than needed in this image, but will get a picture of it now in operation.
