Steve,
If you are going stick with the lower pressure of the 32 S&W Long, Andy may be willing to simply sleeve/reline the existing 38 caliber barrel down to 32 with a TJ's or other high quality liner. This would certainly be both cheaper and faster than buying the 22 barrel and having it rebored, and would be significant for both the time and cost of your build. I've been looking around on the InterWeb since you posed your original question, and I'm not finding anybody immediately available who has stepped in to take Jim Dubell's place. Back in the halcyon days of schuetzen, some rifle shooters believed that a relined rifle barrel would actually shoot
better than the original boring. I personally would be confident to trust Andy's opinion on this.
Be sure and keep us informed of your progress on this build and remember, we all like pictures here!