Could get two C22 cabs and stick them together. That's just about the perfect footprint for a 1k light. You'd need a good fan for active exhaust, but it's doable, since others have already done it. I think BlueBear or TheGreenFog has a double-C22. The first time I saw some pics of a double-C22, it was on overgrow.com, guy called it The Monolith.

Another alternative is a HydroHut Original. They're 52" x 52" x 7 feet, also just about perfect for a 1k light. I have one of those with a 1k light in it myself, although I need to get a beefier fan if I want to run it anytime except winter.