This will give you some idea where most of the weight lies:
On a bike this size the first 10 or 12 pounds come easy. After that you gotta get pretty ruthless and/or creative or else start spending buckets of munny or giving up some functionality. You'll quickly reach the point where in order to save a pound you'll have to think of it as losing an ounce in 16 places.
IMO airboxes exist for a reason, so get ruthless elsewhere. You'll thank me after yor first water crossing. Ditto for batteries. Smaller and lighter ones exist with eqivalent power to the stocker. Unless you go kick-only (don't rule it out) running anything with less actual capacity than stock is gunna make life miserable. Sawing off frame tabs is best left til the end of the lightening process. What appears dead weight at first often served a purpose that you find you can't live without by the end of the project.
I've spent most of my life removing weight from bikes and have given considerable thought to doing exactly what you're planning. Certain things are kinda counterintuitive, such as the assumption that aluminum handlebars are lighter than steel, that disc brakes are lighter than drums or that aftermarket exhaust systems are necessarily lighter than the stocker. In most cases they aren't so if your ultimate consideration is weight reduction some of the stock items will actually be lighter than their aftermarket counterparts. Scales don't lie.
Do all the free stuff first. Buying an 80 dollar set of handlebars which in reality only save an ounce puts that ounce in the realm of caviar and street drugs. When the time comes to spend munny consider a Clarke tank before investing in an exhaust system. The weight savings will likely be greater and at least the Clarke does something. No law says it has to be filled to the brim at all times.
Free stuff involves simply removing things. Passenger pegs, helmet lock, kickstand switch, rear rack come to mind. The rear sub-subframe and fender extension could be done away with if you came up with a top mounted tail light and a means of attaching your plate. Our turn signals and mirrors are simply obese. Vent lines and overflows can be replace with clear vinyl or nearly weightless drip irrigation tubing, certain wiring and components can be eliminated. Yada, yada.
The rear tire, wheel and swingarm assembly is the elephant in the room. Work around it. Think caviar and street drugs. It has 32 spokes.
Bear in mind you'll probably be putting a lot of the weight right back on the bike in the form of heavy duty rubber, skidplates and a lot of the offroad realities like tools, so there would be no shame if the "all-up" weight of your lightened but fully armored and equipped bike came out at nearly the weight of a stocker.