go buy a standard tank try a 90g for that size and put your own balk heads in it and then you have a custom sump. Just make sure the section for the skimmer is the right size the first time. Oceanic sumps are just this they put their own little plastic piece in and bulk heads. and if you want it to be a drilled sump they take out on end panel and put in a thicker panel and drill it. They some times make their bulk heads to fit without the plastic and when they install it the bulk head puts outward pressure on the sides. The sump breaks some times, you are better off just putting the glass bulk heads against the glass sides. This way there is More room for flex and movement. I have fixed a couple of these sumps and I never put the plastic pieces back in.

Bill