We had a big storm years ago, I had to turn my 78 L700 Ford into a chipper truck , it had 4ft metal side racks, used plywood and dimensional lumber for the build, painted it black and put in metal air vents, worked really hard on making it NOT look hillbilly, didnt work, no matter what I did, I could not stand looking at the monstrosity that I created!, I kept it on the truck for about a month before I took a sawzaw to it! Made for some good stress relief, Wood works and will get you thru, but Metal is the only way. If you think it looks ho-dunk then your customers will as well