Biatch,
There's a place in the same complex as UAS that does custom carbon fibre work... They were working on this 100% carbon fibre body race car the last time I dropped by.
The guy is very eccentric, but he does amazing work. He made custom sized sheets for this exact application for me a few years ago... Very cheap too. From memory I got him to do 3 layers of carbon (ended up being about 3mm thick and BLOODY STRONG), and a gloss top coat in double-din size, and it cost me about $30-40.
Can't remember the shop number, but I think the guy's name was Alan. John will remember the guy if you ask him.