A little help with door speaker baffles

[sjv13 10+ year member]

So Im'm going to dive in and replace my OEM plastic speaker bracket and closed cell foam contraption with an MDF baffle pretty soon. I just have a couple questions.

Is it important for door speakers to have some air space behind them?

Right now there is really only room for the magnet of the woofer and I feel like I am lacking some midbass from my door speakers because of this perhaps.

Also, how should I actually attach the baffle to the metal door? Sheet metal screws?

And lastly, I need a little help with the design. My doors are shaped in such a way that the OEM plastic speaker bracket is about 1/4 of an inch away from the door at the top and about 1.5-2 inches away at the bottom (I have pictures on my profile of this) and this makes my speaker sit straight. Does this mean I'll have to put layers of MDF together to get it to be 1/2" thick at the top and 2" thick at the bottom? Hope this is clear enough to understand.

Thanks for any input!

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[fasfocus00 5,000+ posts]

wood and door panels don't play well. use ABS plastic. I always use ABS plastic as the main shape to replicate the OEM design so I can reuse the factory screws than add to that to fit whatever speaker I'm using.