Tips on building Zoids:
1. Make sure to clip off all stray particles of plastic left over from the runners. If they are left on, it may cause some of the heavy coilspring or motorized Zoids to not move right.
2. Don't throw away anything until you are completely through with the Zoid.
3. Unless your instruction manual is in Japanese (I'm not kidding, either, some are) read the entire thing very closely. Sometimes the key to getting the parts together is reading the text that goes along with the picture.
4. If you're working with a motorized Zoid, install the batteries first and periodically turn it on to make sure the head and legs are attached right. If they aren't, you'll hear a distinct clicking sound, this means something isn't right in the Zoid.
For a list of all the stuff I use when building and customizing Zoids, click
HERE.