Welcome to Classic-Castle!
I love Space probably more back 2 years ago, but since, I have split the two in half doing both. Their both great themes space and castle, and the really fundamental themes for many subthemes (Floating Rocks, etc...).
Hope when you son turns 13, he will join Classic-Castle. He will probably have much better technology. Who knows what type of stuff there will be 6 years from now.
"Sow a thought, reap an action;
Sow an action, reap a habit.
Sow a habit, reap a character.
Sow a character, reap a destiny"
"Don't let school interfere with your education."-Huckleberry Finn