Cut out the circular shape with a hobby knife. Lightly brush on sanded edge, then set in flat sheet. Fill brush with cement and touch at joint, allowing the cement to 'wick' into joint. Make sure the glue goes all the way around, but be careful not to brush two much on top saucer. Tape sandpaper to table as before, slowly turning saucer as you sand.
Directions show the bevel angled under the saucer.
I angled mine out, increasing the diameter slightly. The movie does not show which is most accurate, other than showing the edge of the ship slightly off the ground. Paint entire model in a light silver. Then I found spray chrome at Home Depot. I display my model sitting on an upside-down clear plastic disposable drink tumbler.