I assume you mean for hand in mouth puppets held above your head. We always used rolling stools. They where low to the ground between  4 to 8 inches high depending on the height of the puppeteer.  Easy to make out of plywood.  Two pieces for top and bottom of stool.  Then cut strips that about the height and join them as an X by cutting slits in the center. Glue and nail the top and bottom pieces to the X  then put wheels on the bottom of them.

Yes, for hand and mouth rod puppets. I like the wheels idea, did they work equally well on carpet as hard flooring, if we set up stage in different locations we will have varying floors to work on. Maybe we need to bring our own floor covering with the stage to keep consistent. We tried skate boards that slipped off our knees if we moved, wider base sounds more stable. And if your feet can hang off the back end that is a plus as my feet always hurt when kneeling for long periods. Thanks for the new to me idea.