I know this thread is old, but I just had to post.
I own a Sevillano guitar it looks and plays very well. I bought it about 11 years ago during a business trip to Tijuana. I'd recommend anybody who is in the area and looking to buy, to stop in and check out the shop.
His address is Kilometro 1( KM1), Carreterra Ensenada 980, Tijuana, Mex. His phone number is (from the states) 011-52-664-686-5057.
As soon you cross the border by foot, take a COLECTIVO (a shared taxi) and tell the driver you are going to see Luis Sevillano, el guitarrero. It cost about $2 (if you speak Spanish) to $5 bucks (if you don't)