Bob - If, like me, you are building in a small space my first suggestion is to place locking wheels on your bench. (My thought is having everything in the shop on wheels is the way to go). I have moved my two workbenches around numerous times throughout the project.
My workbench height on wheels is 27 1/2" high. I?m 6?2" and it could be lower ? I feel the 24? previously suggested is about right. My bench has overhangs on it for easy clamping of items and I like to sit on a rolling mechanics stool as much as possible to save the back ? even at 24? my knees would still fit under the overhang.
The rotisserie idea is good, but I have done the wiring prior to attaching the tail cone because of limited space in the shop ... so I need to have the fuselage on a bench.