Hey MrMrC, glad you like the pack! The example levels should give you an idea of where to put the individual pieces, whether its architectural or props such as pipes. The architectural pieces all adhere to the 10cm grid, so everything will snap together nicely and fit without any issues. Some pieces such as pipes, or lights due to their nature are better suited to the 1cm grid. Constructing cooridors with this pack is designed to be straightforward and relatively simple. Have you checked out any of the example levels yet? They should be valuable in determining what goes where. Let me know if you have any more questions and I’d be happy to help. =)