The 1/8" plywood tray was made by joining 2 trays together, only because having made the bigger tray I decided to make it longer and made another one and glued them together and it worked out well. You can learn from this and make it the right size to begin with and add a divider after. By the way its 1.5" deep. Keep it square so it fits either way round and a nice snug fit in side. Take your time.The smaller one I made about 3" wide.
Go to Pic 10