Just flicking though my copy of Jaguar XJR Group C & GTP Cars by Ian Bamsley (best book on the subject IMHO, but long out of print). Looks like the dash face is carbon (much smaller, rougher weave than the main tub). The top of the dash is a flat, non-reflective finish, but isn't a flocked finish like alcantara. Looks more like a flat paint to me... at least it would in 1:24.
Very impressed with this build. Looks real nice!