As for skid plates: RPM Composites has a nice carbon fiber three piece for both the PRO Chassis and the AXYS Chassis that covers everything, literally.
The RPM Composites AXYS Skidplate is for the trail sled only at this point. Hopefully he can get an RMK or SKS AXYS sled soon to get a plate made for them! I run one on my AXYS Switchback with the Polaris Ultimate Bumper. I want the same setup on my SKS that should be on its way any day now......
http://www.rpmcomposites.com/polaris.html
Ryan