New product design for prototype

I'm looking to design a prototype for boda boda riders. I have a design in place and prototypes made out of waterproof fabric. However, I still need to explore alternatives in design and material before I put it out. My major challenge in my designs is how the guard anchors on the parts of the bike. I am open to collaborative discussions of how best to achieve the goal. I'm attaching write-ups to expound more on the project.