Thanks Wongy
I will be doing it myself. I was asking for people's experiences and solutions to problems. What they have done. What they should have done. What they advise you don't do and the equipment they have chosen to replace the factory fit speakers in the doors and the rear panels.
I have a Denon 6 channel amp I have had for years and use this with a audio control 6l to convert the signal outs back to line outs. I will get a sub box but note sure whether one 12" or two 8" would be better for such a small space.