J_T,
Got the idea, thanks! It would seem that the process of re-inventing the wheel continues, we've gone from Obstacle Clear Planes to Obstacle Clear Polygons. I've got a nice mental picture of it, from humping runways to humping Obstacle Clear Planes in just 12 posts!
I've often considered using the resultant polygon from putting together a series of STODs, but a tad concerned for the "unconsidered" obstacles lying between the various standard gradients. The people that pay my salary are demanding subservience to their wishes over the next 5 days, might have to put that one on ice with Mutt's beer until I return.
Best Regards,
Old Smokey