It lets you add pedals to any of the Pedaltrain pedalboards to see how they will fit. I have over 200 pedals already and have contacted 20 other companies to add their pedals as well.
i doubt some of the builders here have the time but they should submit photos of their gear so we can build imaginary boards with their pedals. i enjoyed making a board with just moogerfoogers.. and then another with just boss pedals. eye candy.