Here is my version of the parcel shelf mods! Thanks to Adam K's and trustafox's ideas. Squeaking is certainly everyone's number one issue but I'm also thinking since we're there, why don't we put some sound isolation to block out the noise from the back end, amplified by the boot space? This is the tape I use to deal with the board-end vibration noise. It is a kind of double-faced adhesive with rubber padding in between. Bend the board a bit and stuff a small piece through, and pull off the paper and stick the board on to the steel frame. This is how I deal with the brackets: similar tape on the board. I didn't tear off the adhesive protection here because I don't want the board to eventually "stick" to the bracket. This is a kind of self-adhasive sound isolation mat I've bought, only about £8 for a 120cm * 90cm piece. People stick this under the hood to mute engine noise. You can see the thickness, around 0.7cm of fluffy polyester fiber. Don't need too much of it, first cut a section following the curve of the board, And then split it into three pieces to avoid the bracket. Remove paper and stick them on, and we're done! Haven't tried out how good it works though; even if it has no effect at all, feels good to do something anyway.... Happy Chinese New Year!
Armaflex tape could be used to slip under the metal stiffener and cut into strips to insulate the back of the shelf. It's 3mm thick x 50mm wide single sided adhesive insulation tape used by plumbers and about a tenner a roll. The sponge is pretty dense so won't crush flat easily.
Drove the copen to work this morning, but FORGOT I need to test the shelf, so was driving with the top down enjoying the morning sun!