"The Contraband Rocket" by Lee Correy aka G. Harry Stine

Published under Stine's pseudonym "Lee Correy"), it's about a group of near-future rocket enthusiasts who decide to refurbish a decommissioned rocket and travel to the moon. 

As a rocket engineer who played a major role in model rocketry, Stine's novel captures well the passion of a group of enthusiasts for the dream of flying in space and makes for interesting for this reason alone. 

Yet Stine's subplot, in which the wife of one of the central characters leaves him over his obsession with the project, absolutely grates today. What could have added a sense of emotional drama becomes instead a vehicle for taking some Scientology-esque digs at psychiatry (in Stine's future, divorce proceedings are a pretense for court-mandated brainwashing) culminating n an end in which the wife realizes that it's really her problem and not his. Once again, the Fifties-era patriarchy emerges triumphant. (Mark, GoodReads)