There is this guy that makes them billets cases, I never heard of them before but i found them by looking for a chromoly steering stem online. We emailed back and forth and the owner, Tim, seems allright. He told me he can make my stem wathever length and wall thickness I want, and the price is right. I dont know if anybody ever dealt with them but I willing to give it a try. I'll report back whenever I get it.
http://www.geisickperformance.com/crank_cases.htm