What a stunning example you have there. I am a very big fan of the Marui Samurai and have owned a really great runner myself.
Believe it or not these cars actually drive very well even with the kit tyres. Once ball raced and built properly they make a very fun car for the track.
Here's mine in action to help you with a little extra inspiration-
http://www.youtube.com/watch?v=o-sXuW2mgto&feature=plcp