I have help from "The Unofficial Lego Mindstorms NXT 2.0 Inventor's Guide" by David J. Perdue with Laurens Valk. From the book, I got the front half of the halftrack.
The rotating mechanism of the shooter is designed by Yoshihito Isogawa, from the book "The Lego Technic Idea Book: Simple Machines",
and I created the rest myself.
cool
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