Marco Antônio Guimarães is a Brazillian musician and instrument builder for the group [[Uakti]]. 
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Link to his facebook page-
https://www.facebook.com/profile.php?id=100010422428675\\
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An article in Portuguese on the instruments of [[Uakti]]-
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-75992011000100018\\
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A guide to building an [[Uakti]] style glass marimba-\\
https://marimblog.wordpress.com/marimba-de-vidro/projeto-de-construcao/\\