D&D mini flight stands

I went looking for flight stands for the new D&D campaign my group is about to start since two of the players are playing flying races. But I didn't like any of the ones I could find because they don't allow for mini to be directly above another mini. So I decided to try my hand at 3d modeling.

I designed these flight stands to show 10, 15, 20, 25, 30 feet of flight/elevation.