I was speaking with a trimmer down here in Melbourne who use to trim hotties and all show cars for the last 18 years, he said if you got Lamborghini grade hide it would be around 3k a square meter (I think by memory) thats with absolutely no blemishes or marks on it. Also said, better off going for the Bmw grade leather, his cost for this on front and rear seats, door trims and boots would be way under 4k. Aparantley theres a good distributor in port melbourne.
If I paid 10k for a reco'd interior just on leather without remoulded dash, carpets etc etc.. mate, it would want to be able to give mad blowy's too.