Carrazco500 had some real cool pics of his "Pink Panther" zilla on the old forum. I've been trying to twist his arm to join up here to show some of the noobies his tricks. One of the biggest areas in zilla weight loss is in the rear of the frame. Some riders cut it off & substitute smaller diameter chromolly tubing for the basis of the frame. I took a different approach & modified a Honda 400Ex removable subframe to work with the zilla main frame. It was not too hard, but did involve an hour with the angle grinder / cut-off wheel to remove the old seat latch & various tabs / brackets. In retrospect, I would just fab a new removable sub-frame from scratch & use the Honda part as a basic pattern. One lesson I learned this past week with my bike is that it is more drag oriented & is ok for cruising the dunes, NOT 4th gear dune carving. Since you already have a very nice zilla, just ask yourself what you would change to make it more drag oriented. Marvin Shaw "Hillshooter" shocks would be a good shock because of the light weight. Stay away from the "competition" shocks as they are stiff! I'm actually gonna try to trade my comps for hillshooters.  I'm running a +4" Metaltech lightweight swingarm but on hard 2nd or 3rd gear launches, the front will wheelie in a heartbeat. I may look into a +6". 8 paddle haulers on 8" diameter Blue Label Douglas rims & Mohawks up front will be your best bet. Removing the front brake system & any bumpers will take off around 10 lbs.   It may seem petty, but every ounce adds up pretty quick.