Thanks for the feedback!
Doc_Brown, I didn't think to extend the sticker/printed parts over the exposed edges, that would easily hide the exposed foam board sections! The original design called for a slightly more complex cutting/folding job of the board, but I decided to go for the simpler version that (unfortunately) leaves the inner edges exposed. Printing the skin/stickers just a little wider would be a very simple 'cover up' for that. Thanks for the suggestion!
Legozebra, getting the legs to move accurately would be amazing! If I could get the legs to do the appropriate motion while using the tread design to do the actual moving, that I think might be doable?
Creeper walking animation: https://www.youtube.com/watch?v=L5oIBcWzDw4
I'm assuming that getting an object to walk like that in real life would be very, very difficult. But faking it might be easier and still look appropriate?
Mmmmmm ; )