One more from behind:
If you're wondering, the oddly-shaped weight is two pieces of 1/4" plate welded together. They're the drop out (scrap center) from a weld-on beadlock wheel set. Which look like this, and were free:
Finally made a center-hinged prop for it too. These release more easily, and are very consistent:
I had to add rubber feet to keep it from walking across the floor, too. Just something to think about if you're going to build one.