Ok on with what I'm working on.

The boxed tank.

The Ontos is an unusual AFV, designed for the US army then rejected and picked up by the USMC.
The design was based on the T55/56 chassis and had common transmission with the equally weird M56 Scorpion Tank Destroyer.
The Ontos mounted 6! 106mm (really 105mm) recoilless rifles which allowed either fire in rapid succession, single fire or all at once. The resulting output was the equivalent to 6 M48 Patton tanks firing at one. The drawback was low armour and once fired the rifles had to be reloaded externally meaning the tank had to pull out of line or to cover to reload.
I'm going to base my tank and possible diorama on this image.

I guess we'll see how it all comes together!