I think a couple of soul-brothers to Thierry Andre are Michihiro Matsuda, who has made quite a number of out-of-this-world guitars, and needs no introduction here; and also William Eaton, the long-time Director of the
Roberto Venn School of Lutherie
William Eaton has also made many instruments that smash through the barriers of convention, and he's also a fine musician in the cosmic/etheric, so-called "New Age" idiom. If you're not familiar with this man and his work, check out the link.