I cut a lot of the same parts over and over. Like 200 of this or 400 of that, so I've considered creating a custom-fitted set of slats that would allow the torch to cut without hitting the underlying grid and heat warping that, and also including a set of magnetic attachment points to hold things down. You couldn't do it for one-off stuff, but I might try it sometime. I've used weights and clamps before but I don't like having to make sure I navigate around them without crashing into them. I have an old vacuum pump and I've considered doing something with that. I'd just have to make sure I didn't burn the suction cups off. :-)