There are several wool quilts on this board (including one of mine), if you search.
As far as the tartan goes, I would cut off a little corner and try washing it with hot water and soap, vigorously if hand washing, then dry in the clothes dryer if you can. Then you can see how it felts. I have found a great variation, some fabrics really don't felt at all, while others shrink up and get too think to use.
Also, I learned the hard way to put a few bay leaves and/or cloves in with the fabric. The moths ate a hole in one of my wool quilts before it was even finished.