Ive been thru the same problems guys. in the end i went for a set of in phase components,for two reasons; if you twist the standard grill off,the in phase tweeters just slot rite in+look factory done.(ill post a pic!) and secondly because of the depth of the speaker, i would of preferred alpine type r's,but they wont fit without hacking the door away!!
Its very much possible (I did it!) to install a set of components/replace tweeters without taking the dash out!!! If you unscrew the tweeter grills,ull find that ur tweeter is offset to the grill quite alot due to the heating ducts.Just pop them out and unclip the plug.It takes a bit to wiggle out,but you can do it. Then cut the plug off the factory wiring(to allow room for your new tweeter). I dont know if all tweeters are made the same in component sets,but mine had the wires already attached to the tweeter. I fed the wires through the dash,(with a bit of help from a metal coat hanger!) I then aimed both wires over towards the passenger footwell. Obviously the right tweeter tooks neat under the steering column,round the back of the head unit and meets with the other. I fixed the cross overs by buying some velcro pads and sticking them onto the highest point i could reach behind the glovebox (to stop passengers kicking them!!) I had to super glue the velcro pad to the bulkhead because it wasnt gripping very well. I used velcro pads, so it would be easy to get at them or take them out if i needed to.
I got round wiring the door quite easily,i didnt take the door panel off.As u know the speaker grill just pops of,so i swapped the speakers round. Then cut into the wiring loom (not the cars,the alpine one!!)at the back of the head unit,then mounted the crossovers right up behind the glovebox. Doning it this way, does away with the need to get your cable from the door,to the car. Its not possible to feed it with the other cables (windows,mirrors etc) because its a form of plug.
Doing it this way gives a much more factory look. Hope this helps
