Good luck with the plating process. The WR450's are bad-ass. You're going to love the handling and power.
For peace of mind check your valve clearance asap. Mine were perfect. Yours will be too, but check them because a head with 5 titanium valves isn't cheap to repair.
I'm looking forward to seeing what you do with your new bike.
Besides a larger tank, a rear rack, and a good seat I don't think I'll need anything else.