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Just use Coroplast with the grain vertical, and make some slits. Make a slight score on the back along the top of the slits to establish a consistent bend line. Back it up with sponge rubber near the self-hinge at the top to encourage full return to position, unless you like the shape it sets into. For really tidy work, use two layers of Coroplast, with staggered slits trimmed to the web on both sides. Use some foam plumbing insulation to soften the bottom edge.
I've seen RVs with broom like whiskers at the back, too, of a suitable scale, or you could raid a discount store for household brooms to hack.
For extra fun, draw teeth along with the 'stache, but leave off the lower jaw. Eat the road!
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