Do also check out, if you haven't already, this Iwata Asks interview from 2009, which contains further insight into the development of the original Zelda, and m

Do also check out, if you haven't already, this Iwata Asks interview from 2009, which contains further insight into the development of the original Zelda, and more design documents: https://www.nintendo.co.uk/Iwata-Asks/Iwata-Asks-The-Legend-of-Zelda-Spirit-Tracks/Iwata-Asks-Zelda-Handheld-History-/Bonus-1-Ancient-Documents-from-1985/Bonus-1-Ancient-Documents-from-1985-233949.html https://www.nintendo.co.uk/Iwata-Asks/Iwata-Asks-The-Legend-... (Be sure to click the Next button at the bottom of that page for the second part.)