Rhy; this is the only place to get it: http://www.soldam.com/barebone/altium/
You will find all the data on Altium on that link. It's only 20mm larger than Shuttless51g in depth. If you are looking for the smallest duel 5.25 bay case, this is it. Before I desided to get Altium, I took a look at Lian-Li, it's way bigger, compare the dimensons for your self. By the way I bought Altium because of duel 5.25 bays not because I had to RMA my Shuttle SS51g, I like ShuttleSS51g, but it's only secondary to me, Altium is the first. I called and was told I'll be gettiing a replacement ShuttleSS51g, a new one, I will probably end up selling it. Bottom line if money is no consern ( shipping it self will be about $90.00, the whole thing will run about $500.00), go with Altium, It's the same as ShuttleSS51, same motherboard. I find it to have more room, especialy when I was installing the AGP card, it was much easyer than it was on ShuttleSS51 and yes the major plus is the second 5.25 bay. I don't see any other box that is as small and as full functioning as a big tower case.