I've been wracking my brain for an inexpensive and somewhat portable fire pit idea. I've been using a galvanized steel tub for a LONG time (the zinc galv will burn off after the first use, and if you do breathe it in, it gives you a headache, but no permanent damage). The issue is that it still takes up a LOT of space in the back of my truck. Really, all we are trying to do is have something to catch the ashes so that there is no "scar" on the ground the next day.
I was thinking about ideas like the one above w diamond plate, cutting down my galvanized tub, making something with steel and some hinges, cutting down a metal file cabinet or using a drawer...
Finally had an epiphany and thought of using the pan from a water heater!! They are wide, not too tall (I'd still make a rock ring around the edges) and they are cheap!