"If you have a class 3 ffl, you can have full autos for personal use."
Nope. If you are in business with an FFL 01 and an Class 3 SOT stamp, full autos that you have in your business stock for sale to the military or LE are not yours, they belong to the business. If you lose your license or go out of business, you can't keep them as personal property or transfer them to yourself because as an individual you can't own them.
(Yes, you can "test" or "demonstrate" or "function check" guns you have in stock, but again that is business use, not personal use.