I measured and cut the tray to its maximum size that would enable it to appropriately line up with the outer fuselage tubes where the cowling is mounted. I then used a sharpee to mark the location of the support fuselage tubes. Afterward, I physically located each of the electronic devices that needs to be installed on the tray. I came up with a few decent examples for different positions of the items. But before I finalize I need to do a mock install to make sure I have everything, as well as each item had easy access to the device it needs to connect with.