I just use whatever the back and side wood on the outside (obviously) and another wood of generally similar density on the inside. Lay 'em up with epoxy in a laminating form.
I wouldn't worry about trying to influence your guitar's tone by using different layers of side woods. The double side is, as I understand, just to provide a very rigid, and stable rim for the vibrating plates to attach to so that no/very little vibrations are lost or absorbed in the side.
Hope this helps.
Brad
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