Door speakers

[betonj97]

So I looked and looked and found nothing about fiberglassing or creating some sort of inclosure within the door so you can get a waterproof and air tight proof inclosure. I was wondering if anyone has tried this or seen someone do it. Its difficult because of the lack of room within the door, but I am pretty sure something can be made.
My doors were already cut up so running a pod is not an option because I am just going to make use with what I have.
Suggestions I highly appreciated!!!!!