First off, interesting idea...hope they're deaf cuz that much traffic on my roof would drive me nuts with all the noise and vibration Second, put in some stairs so that you can "connect" them. Third, without using a good pattern overlay of wood and manipulating the heck out of it and chopping it up into smaller sections...this looks fine. In fact you could use those walkways to act like stairs with an addition of a gradient overlay to suggest height (black is low, white is higher).