Bear Creek has been running both of these as main match categories for 3 years now, and have strong competition in both. These two are easily the most fun categories, if nothing else just because they are something different and a different kind of fun.
Send it to a Smith that has some experience. Dent removal has a bit of a learning curve and if things don't go as planned, a replacement mag tube is probably hard to come by.
Oakwood Outlaws in TX offer those categories as part of their Monday matches. The folks that regularly shoot the Monday match usually get together and pick which category they want to emphasize to create more friendly competition.
I am retiring at the first of the year and plan to take advantage of their 3 day monthly matches. For those like me that live a little far away they have a bunkhouse and RV spaces for a nominal fee. That way I can make attending the match like a mini vacation.