Hi Duane,
Kid stuff makes me cringe...especially when you spend a long time building something that you want to be proud of...
As for the rotating radar you can do 2 things. Some people open up servos and remove the motor or you can just buy a cheap mini motor. The choice is yours..
Here is another useful link that will enable you to find a mini motor. Also this site has some other pretty useful "stuff".
www.allelectronics.com/make-a-store/category/400/Motors/1.html
-Rich.