[Auton]

Last things first: The rotations, you need to eyeball. I use the rotate command, since that allows me to keep track of just how many degrees it turned. It also rotates the object around its centre (am I the only guy here who'd like arbitrary rotation centers for object?), so that's good. I'd love a more easy way to do this, but it ain't around.

Then, with the rotations out of the way, you've got to figure out what part of the item should be at the origin of the coordinate system. Selecting an appropriate set of vertices means selecting a set of vertices whose centre is at the spot you want the origin at when the move is done. Then you do as I posted above to find the offset you need, and the offset to move the entire object to.