[Canadian]

The biggest problem with an angled overflow box coupled with a Durso stand pipe is that for the overflow to leave sufficient room for all of the PVC fittings (and room to get your hand in there) you end up angling off a fairly large amount of space. And in Darren's case, with a 24" cube tank, an angled overflow box would actually end up with the overflow box being really far forward in the tank.