I will agree, dont cut the door cards if they are still intact. get some others to use.
Also with speaker options, I have mounted a 6x4 keenwood speaker in the original place in the center of the dash, I have wired it to the front left and right+ wires. this gives mostly high frequencies as a center channel. sounds great and ads that little bit extra to the 2 front speakers.[%]
Car looks great and as to which colour is faster, well, undercoat is because it saves on weight if it is not painted. [88][88][88]