Constructing this counter top

[richsc]

While recreating the counter of a thermopolium in marble and plaster is pretty straightforward, I was thinking of recreating the counter seen in the baker fresco from Pompeii (also redrawn in Connolly's "Pompeii")

[url:3u8b1jlm]http://www.bbc.co.uk/history/ancient/romans/daily_life_gallery_02.shtml[/url]

But I can't see what those nails and front planks would be attached to, given that there are all those nice legs all around the counter. The planks seem set back from the legs, so what are they attached to? I was wondering just how much was under this counter in terms of wood that the planks would be nailed to? Or are they just decorative?