Hi shasan139! I actually know of a tank model! Although it's not mine, I think it could have possibly been created around this Alice Community! I got it from this website:
http://www.lincoln.edu.ar/comp/alice/ and I downloaded the Object Pack.zip.
But for your convenience, I have created a direct download for you, in an attachment that is automatically compatible with Alice in a .a2c file!
Goodbye and good luck on your tank game!
Connor + Alice Forever! (-:
Website: www.mccgameco.com
Have a nice day!
Also, I've been gone for a really long time, more than I can even remember and am now going to be way more active! :-D