This is a short video demonstrating the use of turn.lsp (version 1.1.4) by HawsEDC as I've incorporated it into a toolbar button to make it semi-automated.
After running the lisp via the button you can clean up the results for inclusion in your site plans.
Read more about it at http://www.hawsedc.com/ and the wiki page http://autocad.wikia.com/wiki/Turning...