I don't understand the phrasing (though you're not the first to put it this way). What is there to "build"? Ya' get a plastic tupper and ya' throw your cigars in with a Boveda. Done. If you're adding Spanish cedar maybe you'll season for a couple of days first. Then done.
BTW, thin SC is okay for the smell, but doesn't do much else. Thick solid SC, like good humidors are made from or the the trays many of us use in our tuppers, acts as a buffer helping to maintain stable RH.
It's presumed that SC became the traditional material for humidors and cigar boxes because of its resistance to rotting in humid conditions and availability in cigar producing regions. We've come to associate the scent with cigars, but that's an extraneous benefit, not its primary function. And though some will tell you it has something to do with keeping bugs away, that's BS - it does nothing to deter or prevent cigar beetles and wood mites. IOW. veneer is fine if all you want ti the smell, but if you want it to really do its job you'll need more substantial pieces.
I smoke in moderation. Only one cigar at a time. - Mark Twain