Attached Link: http://www.midamerica.net/~tmcurry/RBeta/del2-n-swap.pp2.txt

Well, I have made some progress with it. Building on what you posted, I'v added the ability to switch geometries. Now the top part can be switched between a ball, a cone, and another box. Both items delete when either are selected. The only problem now is that when anything else in the scene is selected, it disapears unless (menu) 'Display' - 'Deformers' - 'Show all' is selected. Also, it disapears when the scene is rendered. Now if those two problems can be solved...