The archaic phrase "hadst it made" means "had you made it" in modern English. It is spelled phonetically as /hædst ɪt meɪd/. "Hadst" is the archaic second person singular form of the verb "have," which means "have had." "It" is a pronoun referring to an object or thing. "Made" is the past participle form of the verb "make." So the phrase means "if you had made it" in today's English. It is a phrase often found in literature from the 16th and 17th centuries.