I don't think it would be a tough job for a guy with Mackinsons machining background, truthfully it will probably be the easiest part of the job. One area of concern might be the fit of the forend to the barrels. That is really the only major issue I could see. A big plus is the barrels on the ideal really don't do a lot of work. All of the mechanics are located in the action itself, that helps a lot.
Another area that might be interesting would be the fit of the locking bolt to the barrel lumps....depending on the fit, either the barrel hook or the lumps themselves might need to be built up to fit the existing bearing surfaces, or a new locking bolt to be fabbed up to fit both barrels. You'd have to talk with Mack and see what he thinks. I really don't think any of the above is a bank account bomb, and it's most certainly within Macks skill set.
