To reduce hallway noise I'd like to replace my hollow apartment door with a solid one, but I'm renting and can't do that (I tried mass loaded vinyl, movers blankets, etc.; it's not enough).
So I'm thinking putting a solid door against it. To avoid having to bore holes for the lock I'd choose a narrower panel (e.g. a 80x32 solid pine slab against the 80x36 hollow door). Would that work, and how would you attach it?