FYI - The Dearborn Inn hotel is a really cool Ford historical site. It's not your typical Holiday Inn or Best Western style hotel and it's only about one block away from the Henry Ford Museum and Rouge Factory Tour pickup spot; I would guess that they have a free shuttle to take you there.
The Dearborn Proving Grounds were originally the Ford Airport and the Dearborn Inn was it's hotel. The hotel is still owned by Ford, but managed by Mariott.
The Dearborn Inn - Wikipedia, the free encyclopedia
No rooms for that package deal at Dearborn Inn for those dates plus it looks even more expensive (but most likely a better hotel, of course).
I found Best Western from this link:
Full-Service Packages
My in-laws are coming with us so got a package for 4 people to include:
The Henry Ford package includes tickets (Double Package: 2 tickets to two attractions; Family Package 4 tickets to two attractions) plus:
•Deluxe Overnight accommodations
•Full Breakfast
•Refrigerators & Microwaves in every room
•42'' Flat Screen Televisions
•Keurig Coffee Makers
•Complimentary shuttle to and from The Henry Ford
•Complimentary airport shuttle (7am to 10pm)
One-night package:
starting at $159 Double Package
starting at $219 Family Package