I wanted to make an externally clean box-like tank with some retractable weaponry concealed inside. To that effect, I implemented a new weapon retraction method for the main weapons deployed from the top. The two rear plates to which the missiles were attached would simply rotate, revealing the weapons from inside. There are also some sidewinders that slide out from between the treads, with smaller ones attached that fold out. A friend who, at the time, was studying tanks, recommended some anti-infantry weaponry, thus the two dual machine guns on the front. There was more than enough room inside to fit over a dozen fully equipped minifigs.