Got the boot and a bit of the passenger compartment done in Alcantara in mine. Got some of eBay (not real Alcantara but some kind of knock off called S-Alcantara) and it looks soooo much better. Not completely happy with it yet, needs some tweaking, but even now it looks a lot nicer and less rattles. Will post up pics when I'm done.
Dash is up next, it looks easy, but worried about the passenger airbag and covering over it. Need to look into what should be done about that.
If you want it all done properly you will be looking at £1k plus. Proper Alcantara retails at about £60/sq m and you'd need in excess of 10m, so thats £600 just for material. Thats with no headlining done.
I take it that you have been doing the work yourself?