Sorry to be a nuisance.
Thanks Dan for that link. But is turns out that I misunderstood the definition of Convex Hulls....this is not exactly what I need.
Convex hulls produces the minimum convex polygon containing all the points, but if the border of the point cloud has any concavities, the convex hull will actually include areas not within the point cloud "footprint". I need a polygon that is EXACTLY the same geometry as the xy footprint of the points.
Any further suggestions will be appreciated, and thanks!