I'm not aware of a 1:350 scale as-built USS Enterprise by Minicraft. Do you mean MiniHobby Models? They have one.
MiniHobby Models (MHM) is the pirate arm of Wasan Moulding Co of China. Wasan is the parent company of Trumpeter. MHM specializes in cloning others work and the quality of their work is generally less than Trumpeter's.
In the States, you may be able to obtain some replacement parts for MHM kits through their importer - Stevens International of Magnolia, NJ.