Thanks for the kind words! If you watch, you can pick up a block of 4140 on eBay pretty reasonable. If that's the route you choose. Or, are you planning on using the shotgun bbl.'s? Should be a nice project. I'm sure pics will follow?
After much wringing of hands, and gnashing of teeth, I decided the easy solution to my short bed lathe was simply to buy a steady rest and chuck the threads, turn the barrel where I want to and then cut that part (old threads) off. Worst case, I'll have to get my local machine shop to face it off before I start cutting the chamber. Or, I'll short chamber it then get it faced off before final work.