Speaker cloth is from Maplin Electronics (had to postal order it)
The cloth is:
http://www.maplin.co.uk/Module.aspx?ModuleNo=17721 to be exact I got the mottled cloth, it comes 1.5m wide and you order it in lengths of 0.25m and it all comes as one large piece if you order more than 1 lol
The bonding agent I used was this (think superglue in spray form!)
http://www.maplin.co.uk/Module.aspx?ModuleNo=36122
When bonding the carpet to the MDF, put newspaper down underneath so as not to stick it to the floor, people, stools, ceilings (and many other things I was tempted to stick it to

)
The size of cloth needed was 1.5m by 0.75m (ie 3 units off their site).
By the way, the shelf was made to the same size as the stencil then planed down to fit with the fabric placed on one side and doubled over to (you can't put it back on after all) so that it made a good fit, the edges were then carefully filed to give a gentle curve. The rear curve to the seats was made too long and then cut down for a similar reason to allow the shelf to pivot, I can measure the gap tonight, and if I aren't too tired I'l take the shelf out and take some pictures of the pivot beam (also add's some strength).
The 6x9 leads have 3.5mm socket to plug adapters so I can swap from those back to the smaller mounts when I can't use the parcel shelf and from maplins that cost about £5 for 4 plugs and 2 sockets.
PLEASE NOTE:
It is very important to wear a mask when working with MDF as the dust can be carcinogenic! I aren't taking any responsibility caused to people ignoring this advice!