[Arran]

 I believe that the Extra Dark Walnut will be fine, the top and sides of most of the 1936 model tombstones are made out of single, molded, piece of laminated and grainless wood anyhow so there really isn't anything there to see. I think it's poplar but it could be any cheap white hardwood really, and the grain (such as it is) runs from back to front. As far as I can remember the Canadian built models use this same style of cabinet, though the front panel veneers may vary.
Regards
Arran