When I was trying to find a battery box for (2) large 12v RV batteries, I found a local battery shop that made all sorts of custom sized battery cases. I'm thinking it was around $10 ... and the venting probably not as good as the retail battery boxes, but it did have holes for allowing wires in and out.
The key may be finding a box local to you, to avoid shipping costs.
I've also contemplated the use of those small PC slot ventilation fans, or just mount an el cheapo PC fan into on side of the box, above the hub, to force a little more air out one of the sides.
Here is an interesting link on a case ventilation project:
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