The biggest problem on something like this is it is just too darn big when you want to zoom in on a driver on the straightaway or a trophy girl at the finish line. That makes the sight lines move slowly as you pan. The agile orientation around a center is lost. I think if you just gave a few more sides to the umbrella and added champfer and bevel to get rid of the rough hewn look it would pop into the space you seek. Think of a rough hewn two by four as used at the turn of the century. Then think of a milled smooth 1-3/4 by 2-3/4 board sold as a 2x4 in the fifities that is now more like 1-5/8 x 1-5/8. The modern board does not have exactly square edges??!! Seee! Now look at any electronic gear. Now look at a camera or a telescope. See how accuracy affects the look. Now come to a circuit where cars must traverse in packs at nearly 200mph with tires sticking at 3 lateral g's with almost no banking. The idea is there to be big and accurate but you also need to be small and precise. Galileo was just launched on a European rocket. The future is calling.