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That would be the ballooner version of the Compax bicycle. There were civilian models as well as military models and I think the military ones had an extra brace in the rear triangle which suggests this is a civilian model. Very cool!
It'd make a unique rider! The missing parts shouldn't be anything unique to this bike apart from other Columbias of the time. If you don't have much money into it then it's worth it putting together or riding as is. They don't have a ton of value but definitely draw attention.
You should be able to get the year from the serial number and a google search of the Westfield database.