Chassis welding is a piece of p!ss, not a terminal disease. I would much rather need a bit of chassis welding than bodywork as, with the chassis, you cut out rot, weld, and slap on some tar. With the body, you need a bit of finesse, such as welding, grinding, filling, rubbing, priming, rubbing, spraying, rubbing. lacquering, rubbing etc.
Give me a rotten chassis any day. The only problem is access, but if it is going in to a garage the will have a lift or a roller.
Hope this helps !