First complete it as a semiauto then convert it with a registered bolt. If you dont make it a semi first then it cant be a host for a conversion. If you have to do any machining to make it back to semi then it was a married host and cant legally be made into a semiRegister the bolt. That seems to be the most common part that most 07/02 SOTs register. It is easier to engrave on than a sear, with plenty of room in the recess of the left side of the bolt.