Looks good Bob. I had a ham neighbor who was big on chasing 160 DX but lived on a small lot. He used your approach quite successfully for 30 years. His top hat was constructed of fiberglass rods, supporting wires of course. He also didn't have room for proper radial length but compensated somewhat for the problem by placing 5-6 ft long ground rods at the end of each radial. The radial pattern was short on 2 sides and longer on 2 sides and he swore it resulted in a slightly directional pattern that just happened to favor Europe in one direction and that didn't hurt his feelings at all.