People should be able to order the DH on the day the order banks are open. Might not be able to add all the options though (carbon fiber wheels, etc) at that time.
The Auto is intriguing, but the Tremec Manual seams like too much fun too pass up. Not to mention that Manuals are starting to become obsolete so it might be the last Muscle Car to have it.
Nobody with a brain is going to pay $15K dealer markup. Dumb people do, that’s why these dealerships charge it. I would never pay more than $1K for a markup and even that’s rare for me.