Hi Ralph, another possibility is if you start with the base solid cylinder (draw solid > Cylinder), you can then use the Construct > Offset > Shell command to hollow it out and give it wall thickness.

To do that, after you draw your base cylinder, before doing the Shell select the top face (click once on the cylinder and then click a second time to "drill in" to select the face). Shell will make openings in the thickened result on the selected faces. So then run Construct > Offset > Shell and put in your thickness. The same thickness will be used throughout so you'll need to tune up the base still with that way with another extrude and boolean union.

Also instead of shell you can select the top face and run Construct > Offset> Inset , which has an option in it for making the inset depth to be set separately from the wall thickness. That's probably the overall least number of steps way.

- Michael