Here’s an image of my tray with two different intake types. The one on the left is the Pearl City style with flats supporting both sides and the right is a cantilevered style. Let me know if you have any specific questions.
E: some important takeaways. 1. Have the bottom half of your tray be solid. Cubes will do in diagonal and it’s important to have room for them to fall flat.
2. Make your tray as flat as possible when deployed. 3. You don’t need to make the bottom solid on the upper levels, just the sides.