sounds like they need or want to do this , but i have other uses for it, lie while you are there not for impact tests but to do other missions ,
first have an attractive device to gather the roack s, second using another deivce be able to unfreeze and freeze , (freezing woul dnbe normal process based on the kelvins) then using engineering secure the rocks together, it could be used to create a housing to whic stuff couldbe placed, we couldbe that stuff , other devices, thruster couldbe added, it coul dhave better insulation ,,like a vulcanization process with rubber, a more durable substance already exists in space. plus it is already in space.
the inpact test is limited to costs my way is viable to a future with plans to use the outcomes in other ways, plus i think the missions should be constand enough to be varied in the way we are completing the takss to gain capacity in space/. but what do you think.