at the moment i'm just using some foam cut into a star shape like the originals, but at some point i'm going to do the knee pad conversion.
and stephen, my armor is FX only its GRP (glass reinforced plastic) instead of ABS, it has a gel coat top layer that give it a nice shine and also makes it slightly off white instead of the blue tint that ABS has.
only problem with it though is if one part breaks i'm screwed as replacements parts are no longer available from the seller.