Endorsement Vs Type Rating
1. You don't need the 100 hours at all. You need your instructor to sign you off when you are judged as being competent. This may be in 2 or 3 hours ICIS.
2. You would become ME rated and endorsed for that specific aircraft as a type rating. Usually, this would not entitle you to instantly fly a pressurized, turbine engined aircraft unless your initial endorsement was for that same, pressurized turbined plane.