hello. I am also working on my father's maternal line of the Cuellar's. and I am currently in Jalisco, Mexico. your note of the Cuellar's caught my eye. because my Cuellar line are related to the Sauz de Macias and did much work for the churches that you wrote of. anyway I looked up the names you mentioned on another web site and got listings for all of them. you can go to
www.familysearch.org and see the listings for yourself. most of their findings are on line. just create a username and password. you can view the listings by viewing the on line microfilm similar to ancestry.com. have any questions write me here. good luck.