Caterpillar is made of rubber. You can reproduce the separation and merger mechanism of Magella Top and Magella Bass. The base of the gun barrel moves. The main gun is removable and can be replaced by Zaku (sold separately) on the same scale as a Mazera top gun by replacement.
1/144 Mazera attack (Mobile Suit Gundam) (japan import) - B0016E8Z1K