I have a couple ideas. Thanks for the vote of confidence Geno.

One possibility would be to weld up the holes, use a piloted core drill to drill, then finish ream, the barrel out in a few steps to the largest size that would be comfortable, leaving say something like .050" wall at the muzzle, then drill a shorter depth in a larger diameter for the chamber area, then machine a barrel blank to slip fit, cut the chamber and you'd have a lined barrel...ala Teague.