Precisely the sort of thing I was thinking of, Ronin...not a massive change to the site's scripting that would allow you whatever cab you wanted for your build. I think we can stick with the current case layout models for the Grid itself. This would be more of a "gallery" of cabs with full (authoritative!) specs, with space available probably being the best ranking criteria. That way, you could just use the navigation buttons in the existing scripting like we do with modules...you just wouldn't have the ability to pop one up onscreen to build in.
Right now, I see three primary criteria on the case listings:
1) Form factor. Is this a case? A rack housing? If it's a case, is it portable? Does it offer a lid for transport? Does it fold for transportation?
2) Power. Is the case powered? If so, does it use flying busses or fixed busboards? Is the AC supply internal or external. How much current is available? Is the power in "zones" (think Arturia here) or overall?
3) Dimensions. How deep can the modules be? How wide are the rows? What's the total available hp? What external physical dimensions does a case have? If it folds, how big is it for transport?
As far as materials, special latching (like ATA-compliant hardware) and so on...those can be in the case descriptions. Sticking with the above criteria for sorting and sifting through seems to me to be key here.