Weell. I would not weld on the part where the steam chamber is, don't care if I can make it look good or not, that would require emptying the kettle and filling the jacket with Argon and then welding it, no thanks

If its just the "regular" kettle surface, no problem
I have for one, had to reconfigure and readjust a lot of factory specs that were simply just illogical. Brand new oven shows up, 8 months in I am getting alarms from the burners like they are trying to sing a christmas carol, "certified and trained" tech shows up... "Hey, Im oliver, just curious, have you worked on one of these?"
"aah.. No, never even seen this model before" Well that's inspiring.
Turns out I knew more about it than he did but either way, ended up personally calibrating the burners to the correct emission ratings because they were messed up from the factory. So I don't really care too much about factory or manufacturer as long as I know its right, and if I don't know for sure that it's right, I get the manufactuerrs blessings just in case I am wrong
The thing that I make a point to do, is to get the OK from the manufacturer before doing it.
See ya on the other side Ectofix

Funny to run into you here.