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Rumor has it that this may be Keiko Abe's last USA appearance, so I also agree with Scott.WM

Try "Bluegrass Girl (Hey, Lester!)" by Murray Houllif, recently published by Studio 4 Music.WM

It's not entirely clear what you mean by "lenght" and "width", but almost every marimba has hinged rails, either down or sideways....