Tip: If you place a moon, midpoint, or dragon coin through Map16, it will always respawn whenever you reenter that sublevel. It will not respawn if you add it through the Add Objects/Extended Objects window.
I don't wanna get in the way of your designing method but placing such tight corridors and nonsensical zigzaggy lines first and throwing in enemies later seems like a recipe for disaster. I have no idea what you're doing. Is this just an aesthetic proof of concept/brainstorming?