I made one last year out of heavy leather worked ok, enough room for spare goggles heavy gloves and a belt. Seems to get a lot of belt dust all over it, messy when you go to use it, plus the side pannels aren't the quickest things to remove and reinstall. Also blocked the air flow on the hood vents. (maybe over heating the clutches reason for the belt dust?)
I installed a yosh rs-5 muffler up high, I'm going to relocate the tail lamp and make a tunnel bag.