Mopar92,
Most if not all the responses here make a valid point but your question was if I'm right, what would it take to build a full auto 10/22 for personal use & still be legal. I'm assuming you don't want to do it the "Expensive" way. Brother in arms I'm sorry, I don't believe there is a "Cheap" way. Sure there's devices, stocks etc that will give you what your looking for but to be "Legal", the costs are insane & not worth it for a 10/22. Look at it like this, the FFL, paperwork, stamp etc is in the thousands. Unless you have the smithy abilities, a drop in SEAR alone for an AR can be form $10,000-$18,000. These costs are there just to keep average "Good guy" from having the means. Is it right, no. Is full auto fun, HELL YES!!! Is it neccesary? That's a thread I'm sure has been argued to death & I'm not going to be the dumba$$ Newbie to start it again but IMO I don't believe I should be told what I can & can't have regardless.
Example, I may or may not be apart of a group of guys, all good friends & family that enjoys this sport. One day they all get together to go do some shooting in the hills. At some point as I understand the story, they all pull out their AR's, load up, get in a line & proceed to bumpfire(thumb in belt loop). I heard it sounded like, I'm sure you get the point. The next day it was heard that the area was covered with "Black" cars & SUV's for a couple hrs.
My point, unfortunatly we have some BS laws for whatever reason. Stay out of the "Gray" area.