Raised up and pushed back as far as it will go. Lowered the machine to the base then disconnect the slings and slide the machine base over to the right to get it lined up with the bolt holes. Bolt it down.
Next raise and position the mill head. The crane wouldn't quite reach when it was high enough so I just pushed the bottom in towards the hole in the machine base and lowered it slowly as it canted itself in while I pushed it by hand. (Should have done a video)