The Tank itself was essentially, the Sherman chassis - the original mold had been retooled slightly to add a large panel just behind the turret and some work on the upper surface to admit the bigger steel dome. The turret sported four metal barrels and an integral mechanism to elevate them. The missiles themselves were more like harpoons as the majority of the body of the missile had to reach deep inside the turret to the firing spring.
I had originally seen the Missile tank in the catalogue long before I saw the Sherman and had been immediately impressed by it. Not long after buying the Sherman on Ebay, a 'spares or repair' model of the missile tank appeared and I was able to buy it. It was missing the missiles and box and the motor was in worse shape than the earlier tank, but after a lick of paint and some cosmetic fixes, it displays quite well. Below is shown a more complete version on ebay, the missiles tended to have rubber tips which were prone to perishing with age, so after forty odd years, its unlikely that I will find any now!