I received a new reference a couple of days ago that ought to be quite helpful – The Spanish Inquisition, 1478-1614: An Anthology of Sources, edited by Lu Ann Homza. It contains many original documents (though the elusive papal bull appointing Torquemada as Inquisitor General continues to evade my efforts). Most interestingly, there are transcripts here of actual confessions, interrogations, etc., which I ought to be able to employ to great effect in supporting the veracity of the fictional accounts. I have, as well, drafted a brief introduction to the novel, though I mean to do more with this, likely when the text is concluded. What has already become particularly satisfying about this project is that it appears all of the characters will be genuine historical characters, though engaged in fictional activities. There seems an ample supply of them to preclude the need for making any up!