Greg
We're on the same page. That's basicly what the drawing abv. is. I just wasn't sure if that was a butt joint or not.
The normal drip edge on a door also has siding over it which provides a counter flashing of sort, with T1-11 you don't have that luxury. If you can get the drip edge back past the face of the T1-11, idealy like you're upper joint with a vertical leg, you're 2 steps up. It is a pain to make the extra cut, but just think of the T1-11 behind the head casing as a spacer.
Good rule of thumb for all flashing details: If you can make the water run uphill 1" or more before it gets inside. It probably wont leak, but....