the booth is built with 3/4' laminated plywood, we'll have pics up soon (would already but the hotel wifi sucks.) the iPads sit on small metal L brackets fastened to the wall and are held in place heavy duty velcro. the L brackets have slots cut in them to allow the the connectors to pass through. everything is spaced and laid out such that the ipads are end-to-end horizontally and only have about 1/3" between them vertically. i'll try and get some close up pics tomorrow.