Talk:NPC/@comment-46.7.97.28-20120119214657/@comment-76.174.80.210-20120120214038

in short, what I was quoting is what you need. The reason it's not letting you place the npc banner is because they need one solid block in the center floor. Keep using platforms for the floor will not let you make a room for the npc even though it says it's suitable..