It depends on the type of wood and the year round moisture 'swing' where they will be located, but laminating planks over a void free plywood cab is fine for even the wide 'swing' a cabin is likely to encounter. Pre-laminated planking (strips or scrap such as butcher block) sold to make benches, table tops is fine all by itself and is thick enough it normally doesn't need any bracing.
I got so sick of building matching butcher block speakers, coffee, end table and counter tops back in the '70s that I finally refused to make any more. Did some 1x4 White Pine glued to plywood MLTL cabs that the owner treated with a bleaching agent which turned out real nice once sealed with a water clear satin varnish.
Then of course there's the knotty wood Pine or similar solid wood paneling for that rustic look over a plywood cab and a lot less effort than applying a bunch of single boards..........
GM






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