I know it may sound silly but my consideration is to reduce costs due to the amount of metal used in standard space ships. Wood/bamboo for framing and clay around it, that is it for the hull.
I'm NOT considering it to be launched from Earth nor worried about reentry, it is built for space only. I'm thinking of something that can be assembled/molded in space and with an engine it could be launched in some direction and travel.
A very important part is if it is able to hold air inside for the crew to breath. Otherwise it would only be useful for cargo from station A to station B.
I searched for articles about clay usage in space but could not find anything relevant, also I don't know what happens to clay in very low temperatures.
Certainly the crew should not be letting water hit the internal side of clay walls as it would be absorbed and with a chance to became mud, or is it not?
Also not worried about space debris as I think metal ships would have the same problems.
Would the clay crackle? Would we need to put the whole ship inside an over after molding or would it be better to leave the clay in a more malleable form?
What if there is a hole in the clay hull? Would a ball of clay be able to close it?