Excellent.
Mike is right; the more KXs the better - green is easier to spot on the track amongst all that yellow.
If you need plastics, decals, or backgrounds, I recommend Nightmare Racing - they specialize in Kawasakis. Great guys and their plastics are really nice compared to others I have mistakenly tried. The site is kinda pleasant to browse as well!
http://www.nightmare-racing.com/
I have used oval backgrounds and then added vintage style numbers. Actually my pit crew, trainer, and wife does the numbers. I think it gives a vintage bike a nice era appropriate look. Look forward to seeing how your pre-printed combination works.
I picked up a 1 owner 81 as a back up parts bike a while back. After I looked closer it was nicer than I first thought, except for the painted tank and plastics. I ride it quite a bit.
The 81 KX is a nice bike - you will like the suspension and way it handles. The power curve fits me well.
It will be great to see another KX at the track. And after watching your videos we can now look forward to a green bike out in front.
Dano762