Thank you for asking! I really should have this info on each template page (one of these days, I'll get around to it!) Here are the dimensions if you print the template pieces as-is:
Outer towers & walls: 16"W x 16"D x 10"H (not including cone turrets)
Inner towers: 6"W x 6"D x 17"H ((not including cone turrets)
You can always shrink the pieces to make a smaller castle if you prefer.