Made my own skidplate today.
Took a 5mm aluminiumplate, cut in 23cm x 70cm, bend it in a large wise, according to a model of the frame I made in cardboard.
After I have drilled the holes, I mounted the plate, and draw the desired shape, and then cut it out with a jigsaw.
I glued 2mm rubber on the inside, but it is still a little more noisy than before.
Maybe It works like some kind of "guitarbody"