It probably depends on what needs repairs. Repairs around the fuel tanks will be difficult as they would not readily have the equipment to purge the tanks of th

It probably depends on what needs repairs. Repairs around the fuel tanks will be difficult as they would not readily have the equipment to purge the tanks of the fuel/oxidizer. Anything that is bulk structural is likely to be repairable to some extent. I would not be surprised if part of the reason for building these in a tent is so they can gain experience for building/repairing these rockets with as little infrastructure as possible.