They are made mostly out of thick card, scored to look like planking, then painted and 'weathered', with cut down cocktail sticks for axles and for the pole holding up the banner.
I experimented with one as a prototype then made the rest to the same pattern when I was happy with the result, varying small details such as the 'vision flap', .
The pavises on the sides, and the various polearms sticking out, were from Donnington Miniatures.
http://shop.ancient-modern.co.uk/equipment-116-c.aspFigures are a mish-mash of Essex, Donnington and Magister Militum. The Banners are mostly from a wargaming flag website (can't remember the url) with one from a nice Little-Big Man Studios set.