Al, I just noticed that you have some of those red magnetic clamps in the last picture. Do you have any thoughts on what size and type work best for you?
The red magnetic clamps are handy and have multiple angles on them for holding your work in different positions. One problem they can present is if they are to close to where your making your weld the magnetic field can make it difficult to get a nice weld. If I need to have one close to a weld I try to get the piece tacked down and then remove the magnet before finishing the weld.