Hey mate - just a note on the chain covers. I did something similar on mine, but used bike tubes. The problem with anything 'watertight' like rubber or the treated canvas you have used is that the covers fill up with water and rust the chain, then when you open the tailgate you get rusty water spilling all over the place! I recommend punching a couple of holes around the halfway mark of the covers to prevent this.
Cheers,
Adam

