On my old 14.44 I just had the privacy screens, basically a shade cloth screen, they kept water out in some good gully raker storms and allowed some air flow which kept condensation down, while they were store bought it would be easy enough to knock up some shade cloth with eyelets, bungy cord to hold in place instead of forking out hundreds of $$$............
Even though its a few years old I would wipe down the canvas to get it clean of dust and dirt, then give it a good soaking of waterproofiing, I get the liquid in a 1lt bottle or tin and put it in a spray bottle, available from most saddle shops or rural suply shops, spray cans don't cover enough, also use it on my dizabone coats and gear as well. whatever brand you get read the instructions fully clean dry canvas to start with and don't pack it away till its fully dry and it shoudl be good for a few years depending how often you use your rig........... after its all dried off a rub over all stitching with bee's wax makes sure the stitching is sealed.... Never pack away for long periods if damp or it will rot...
