Like many mustangs the radio opening in my 65 was butchered and I'm wanting to repair it with the metal radio repair panel.My question is how difficult are these to install and for those of you who have installed one did you weld in the entire repair panel or did you cut it down to size? I'm not a welder, but I figure I need to learn and practice alot before attempting this repair. What welder would you guys recommend for doing something like the dash repair panel or floor pans, a MIG or TIG welder. I do have access to an Arc welder would that work or is the metal to thin to use one of these?