The puzzle pictured is made of 1/4" Basswood for the box and 1/8" Basswood for the top and locking mechanism. The darker pieces were stained a walnut color and the lighter pieces a cherry toner. The entire box coated with a clear lacquer. Kits may be available in the future that use hardwoods for the visible outside faces.
This BH puzzle kit has alignment pegs built into the parts to make assembly easier and virtually every part in the kit is labeled. The plans for this kit are free.