Heavily customized, scratch-built “SFX” version of the Estes Super Big Bertha, done up as the Mars-based, fission-powered freighter Atom Heart Mother. 1.6x upscale of the classic Estes Big Bertha at 2.6″  diameter. Approximately 1/100 scale. Drop tanks are removable. Flies great without drop tanks on a 24mm E9-4. 

This model needs some more greeblies and/or markings; it’s missing its portholes and hatches, at the least.