Adding a liner seems like a pretty difficult job to me (making it fit, glueing it on and all that - would maybe also interfere with the proper fit). I would not expect the additional lining to do much in the way of sound insulation (the lining on mine and all the ones I ever looked at is very thin). Common opinion on the sofftop is that it not the best engineerd part of the car, is very hard to get right, and, as a result, relatively many people complain about the mechanism's operation.
The chrome strip is probably still available through the usual suspects ;-)