I'm running an a/x this coming weekend and these folks play by the rules. The SCCA Solo rules no less. I've been running my car w/out a firewall for about 2 years now and no one has ever said a word about it during pre-race tech. But this weekend will be different. Rules say I need a bulkhead between me and the engine to protect the driver from flames(!) and liquids. OK, they're right, t's time to do it.
I got me some .040 aluminum and started with a cardboard template. It's made using two big pieces and a removable center section. I also popped on some smaller pieces to fit against the inside of the body. It mounts so that the lower edge is on the engine side of the existing car's double walled bulkhead. This way any fluids will hit it and drain to the ground instead of draining to the interior of the car. It will also act as a heat shield between me and the engine. It can get pretty hot against my back when I'm sitting in that aluminum seat on the grid.