So I've discovered one thing that may be an issue.
Is the second photo you can see the support beams that I have planned to support the kettles.
The two on the outside have a rather small gap between them and the end beams, so I could have problems welding in there, and I would most definitely have issues getting a grinder in there to clean up the welds.
So I think what I will do is reduce the width of the entire stand to make the end beams the support beams for the outer burners. I will also probably want to move my control panel a little further away to keep the heat away from it.
Any thoughts on how close will be too close for the control panel to the burner? I'd like to avoid melting wires if at all possible.