I think this is about right. (1) and (5) will be really costly -- enough that a fine may not be necessary as such, but still, set a minimum total cost, and if they don't exceed that then the balance must be paid as a fine, that way Boeing has a decent incentive to spend that much money fixing the problems correctly.

(3) is obvious once you accept (2) and (4).

(2) and (4) would have been very cheap by comparison to the cost of all the above. Even all of the above would have been much cheaper done up front than it will be now.