Right, the kit does not include any of the sleds, though it does come with the cable "rig" (don't know the proper name for the framework used to run the tow cables out the back...) I have been researching the web for some good images, but a NATOPS or similar manual with clear tech drawings would be helpful. The Mk. 105 sled is a "weird", unsymetrical collection of shapes, so modeling it will be a challenge. Nothing yet on dimensions, but the Navy's image library has a goodly selection of high res images that look helpful:
http://www.navy.mil/view_photos_top.asp
Excellent resource for all things (recent) US Navy.
Cheers!