Wow I really need to update this thing! As for questions...
Oem heater lights are green? Hmm, I seem to remember mine being white? I do have a heckler led conversion on the heater now but I think this was after the buttons but I really can't remember.
I personally think the sound deadening made quite a nice difference. I did under the rear seats, inside the rear quarters and all the boot area, both doors. Made a nice noticeable difference.
Can't remember the quantity mate but if you search back in this thread I'm pretty sure I put all the details of the stuff I used?
I remember it being a stupid amount for how little the buttons cost. I think the buttons were 40 quid or so, and they charged me about 25 to 30 quid. Bastard s.
I know some people didn't get any at all though, like Jake iirc.