For a story I'm working on I need to send mined lunar water up to a Mars spacecraft being built in lunar orbit. The concept I've designed is a rocket made out of ice (strictly speaking, hollow-cast ice fuel tanks holding the LOX/LH2) on top of an engine akin to the original Rocketdyne RL-10. All-up mass at launch around 50,000 lbs. Very roughly, imagine a rocket the size of a V2 made mostly from frozen water. The (alternate) timeline is the late 70's - early 80's, using materials/concepts of the time or those that were being developed and discussed.
Anyone ever heard of such a thing, even as a paper concept? As fiction, accuracy would be nice, but verisimilitude is adequate.