Well, it looks like I have built a tank!  It weighs 6lbs 1 oz.  The good news is the CG is right on the money.  However, I had to add 0.4 oz to the left wing tip to get it to laterally balance.

Any suggestions on how I can lighten it up, or should I just finish it and see how it flies.  I am kind of disappointed right now.  The box says 5.75lbs so I guess I came in 5 oz heavy, assuming the covering doesn't add much.

I figure I could use a micro servo for the throttle, foam wheels, but beyond that I don't have much idea.  The battery I have is 1500mah Nimh that weighs 3.5 oz so I don't think I can save much there.