I've seen plenty of shots of lexan guards on truggies\buggies but i'm not sure how they would hold up on a Flux used as a basher. How thick can you buy it?
Originally i used plastic cover from an A4 sheet paper holder. It was too thin. I run in a few places that are a little rocky and the guards were shot to pieces by the flying stone after just one run.
Then i had the idea to cut the guards out of this document case that i no longer needed (don't think it was that expensive anyway). The material was much thicker and withstands the stone strikes well.
Close up of the mounting method. Basically just zip tied through the two holes in the arm. The third zip tie to the top is needed to stop it bending forward after a while. This method works well except that after 10 runs or so stone strike will usually wear through the bottom zip ties but they are easy to replace. Combined with a guard that I used to mount on the rear stock Flux battery mount the rear dog bones and drive\axle cups would remain very clean compared to no guards. Also used to get stones jammed in that area fair bit before i put the guards on, well worth the effort.