I have seen Alain's and Mark's videos with their 13-strings. Here is another player I stumbled on while surfing YT the other day. His guitar sure looks like a Michael Thames, but he doesn't mention who made his guitar.
2013 Jeff Medlin '37 Hauser 640mm sp
2006 Michele Della Guistina Concert 10 string 650mm ce
2005 Jose Ramirez 4E 650mm ce
2005 Manuel Rodriguez Model C3F 650mm sp
2003 Manuel Rodriguez Model D 650mm ce
Definitely a Thames Dresden or a close copy. The neck is put on at an angle to keep the left hand and arm position of a standard classical; the neck meets the body at the 10th fret; looks like one of Michael's bridges; and 8 strings are on the fingerboard.