This is exactly what I’ve always dreamed of for a lego set. The lights added more to the set than you could ever imagine. Yes, there aren’t exact institutions of where to run every single wire, but with just a tad bit of common sense it works out great. There is more than enough wire to hid beneath or between bricks. The instructions show how to add it after the build is complete, however if you incorporate the wires while you build, it’s extremely easy to keep them in between bricks. Highly recommend. If you need a step by step as to where the wires need to go, find something else.