lexan is still available, just looking at some yesterday. i would personally go mesh. track porting is not gone, its here to stay as it just works better. yes track life is down but its better. try the mesh hood. timbersled skid. fabcraft tunnel and trailing arms. check out fabcraft classifieds...
this time of year cooke usually has morning pow on a deep base. hero snow. great riding. you can haul into cooke from the north and park in cooke. try sledtherockies.com
i run 420's from my 2500 elev up to 4500. always been rich, if you i would also like an answer for when i go to the big mountains. my local mountain sled ski doo guy told me try 380's