you can fit alot into those doors belive it or not.
heres what i have in there currntly. its about as deep as alpine type-r and its a 7 inch woofer.
i had alpine type's in there and they fit ok.
although its not a noob job. deep speakers require some extra brackets to get exact mounting position.
i have about 1/4 inch between glass and magnet. and same in front of the speaker.