Then the parts that can be used will be destroyed instead.
The problem is, some of those clown just grab whatever is available. I've seen all kinds of different cars derbyed, even a Camaro. Now that one folded in like a house of cards!
I got tired of it though, same old schtick, go muddy up a field and let them bang into one another. The 58 Plymouth garage find that some clown derbyed at the fair a few years back did it for me, I've got better things to do with my time. Glad you've saved some parts at least.