I thought the 100 hrs if part 142 applied only to the ATP certificate?50 is the max . . . . Unless . . . the sim being used is approved as a part 142 sim than you may use up to 100. But, let's be honest. Who in the world operates a flight school with a part 142 approved sim who doesn't charge an arm and a leg to operate it. It takes too much to certify a "training center."
You don't have to use a CFII, you can use a CFI.