Perfect mate.. Ok this is what i would do, and by the sounds of it, you may already be on your way.. If i had the option of either a pod filter alone, an airbox with a "toast slice" filter (what you have on the LXR) or an airbox with a pod filter inside, i'd go for option c... If it's possible, i'd perhaps get rid of parts 8 and 9, (filter panel and backfire screen) and just go with the pod filter mounted on the end of the hose as you stated. In regards to the dust and water problem, all airboxes will take on both.. If you have a boating store near you, or even a hardware store, you can buy very simple one-way hose valves.. hard to describe, but you could drill a hole in the bottom of the airbox, glue in a short length of solid pvc hose about 10-15mm in diameter, and assuming you can find a one way hose valve, mount that on the new bit of pipe out the bottom of the airbox. what this does, is allow any water in the airbox to drain out, but not to enter it... Actually, if you go have a look at the bottom of the airbox on your big KLX, there will be one of these basic one-way valves for airbox drainage.. As for the air intake, you could probably manufacture some sort of small "directional" snorkel so you can direct WHERE the air comes from... either from in front of the bike, or the back... surprisingly, most bikes are angled to take air from the back... EG: yamahas that have little gaps in the side covers at the back, to "suck" air into the airbox, and on the 98-05 YZF's, they also had little cutaway channels at the back of the seat, in the rear guard for the same effect... it's basic venturi induction... Think of the backward facing bonnet scoop on SLR and A9X toranas... hole faces the wrong way, but aerodynamics suck the air in good and proper... well you can do a similar thing with the airbox intake, as well as shield the intake from splashing water etc... hope that helps mate.