Flooky, have you bought the speakers already? If so, what have you got??
Crossovers in the doors wrapped in a bag is a bad idea, water WILL get into the doors and into the bag somehow and damage the crossovers. A better place for them would be both sides of the dash, so open where you would get to the fusebox, ive placed one above that and the other on the other side of the dash.
Baz