Wasn't necessarily hard, just dusty dirty and time consuming. Lots of grinding! Got a little down after hours of cutting and grinding with no obvious headway! But in reality it wasn't hard. Definitely not something I'm in any hurry to do again!
Thinking of doing mine as well, i could patch the 2 pans that are bad but im thinking it'd be smarter to just replace it all, did you worry about the body shifting any or did you brace it