(1) It cost 263 yen per set. (Made in 2002-2006)▲This set is discontinued.
(2) For ages 12 and up. Those are not toys for a young child. You keep them displayed as a collection.
(3) They are not magnets. They snap in place or are just set in place.
(4) How to store them.
(5) I made 1/12 scale room box / table / chairs.