door enclosures

Okay so let's start off saying I'm new to using forums so if anything is incorrect please bear with. Also new to custom audio. Okay so pictures will follow and I know what I'm doing isn't perfect so any tips as I go would be absolutely amazing!! My current thought/progress I'm currently making...

I have Boston pros in my doors and I've been wondering if mounting them on the door panel itself and sealing off behind it would be a good idea. I've heard that they are meant to not be in an enclosure but would it improve sound and give me more lows? I got this idea in my head because I heard...