Don't know about 1/72, but plans in 1/48 can be found at
www.realspacemodels.com Go to the menu bar and click on drawings. The drawings are done by Dave Weeks, one of the top-if not the top- real space model builders in the country. You'll also find a 1/72 CSM, that's first rate as well. Airfix is rumored to be rereleasing their LM in 1/72 so that should ease your burden a little. Be sure to post pics as you go along.