Pressure treated lumber is most certainly not my first choice. It is generally very wet and moves and splits a lot as it dries. I would think that the chemical content would be hard on the tools, in working it and because of corrosion from contact. The only way I would consider it is if it was of the new treatment process, had set up long enough to have dried very well, was being used on parts well away from any tool contact, maybe for the legs in damp locations but there are still better ways to deal with that. Just say no.