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Marco Antônio Guimarães is a Brazillian musician and instrument builder for the group [Uakti].
Link to his facebook page- https://www.facebook.com/profile.php?id=100010422428675

An article in Portuguese on the instruments of [Uakti]- http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-75992011000100018

A guide to building an [Uakti] style glass marimba-
https://marimblog.wordpress.com/marimba-de-vidro/projeto-de-construcao/