Table Saw-yes, skill saw maybe, but I wouldn't use it for a cage for the reason you stated above welding seams. Everytime I cut something with a skill saw there is at least one small wave in it and it drives me insane. I'm all about Mcguver style fixes when its necessary but when I have access to the proper tools and am making display cages there is no reason to do it any other way than the correct way. Plus back to the OP if I paid a company hundreds for a cage/rack the last thing I would want it compared to is MCguvery haha.