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It only takes a couple of minutes to get the door skin off.

I'd recommend doing it so you have an idea of what you need to do before you choose your speakers.

A well made MDF mounting plate can level off any contours in the door and cover with loads of silicon. If you're wanting some base replace the plastic rain coat with some dynamat style sheeting or the base will rattle everything in the doors.

There is cheaper stuff then dynamat but it's crap. A box of dynamat will set you back about $220 and do both doors and most of the floor. you can fit just about any speaker into the doors of an mx5 Jack.

Correct.

You will get better performance generally from a sealed enclosure, however you do need to get the volume correct (or at least close).

For example, sticking an 8\" midbass into a 2L enclosure typically wont do you many favours - not only will it limit ottom end depth, but it may also result in peaks in the upper midbass which doesn't sound pretty.

If you can get a speaker into a suitable enclosure, it will beat a door pretty much every time.

Careful dynamat weighs a ton I hear its around 4 kg per door.

Wun, you need help... seriously.