These stools were super easy to re-upholster! The cushion portion can be unscrewed from the base, so I was able to cover then with a custom fabric and then reassemble the chair.

A note on assembly - the instructions in my box told me to remove the plastic tip on the end of the center post - DO NOT THROW THIS AWAY. You need to reinstall it for the lift function of the chair to work, but the instructions don’t indicate that.