For an Auto 5 Magnum Twelve, the biggest part about putting a sling on it will be that you have to drill the buttstock in order to put in a sling swivel, which is permanent. The other attachment point is the magazine cap, which is no big deal as it isn't permanent.

I wouldn't cerakote the Miroku barrel as it's an invector plus barrel, which is more desirable than the standard invector barrels since it's overbored with longer forcing cones.

Bottom line, a lot of turkeys have been killed with wood and blue shotguns.