What wood for home made reso plates?

i need to make three of these. what's the best wood to use?
The World of Percussions
http://www.mycongaplace.com/forum/eng/
http://www.mycongaplace.com/forum/eng/viewtopic.php?f=14&t=5165
Derbeno wrote:Luis, when you decided what wood to use, you want to copy this design by Meinl.
I got one that I put my Tumba on. The grooves greatly improves the sound