Here is the Castle at the end of Main Street. I figured it is 175 feet tall at the top of the highest spire. I also listed the opening day attractions on my current plan.
Main Street USA:
Disneyland & Sierra Nevada Railroad
The Ben Franklin Experience
Adventureland:
The Enchanted Tiki Room
The Jungle Cruise
Frontierland:
Unnamed Steamboat
Fantasyland:
Snow White's Adventure
Unnamed Carousel
Alice in Wonderland
Dumbo's Flying Elephants
Peter Pan's Flight
Tomorrowland:
Tomorrowland Speedway
Flight Circle featuring The Flying Saucers
The Peoplemover