Pull down nesting box door

[GApeachmama]

I have an external nesting box that I want to amend. The door is pull down and not quite ready. It’s super heavy. Everything my husband builds is heavy. He builds it to be manageable for a 6’4” 280 lb man. I’m definitely not that size nor that strong.

Below are pics of the door and inside the door. Any suggestions? Do I need the part where he put to seal the door? Can I move the hinges down?