I'm afraid I know nothing about 3d modelling, but i'm sure that this has been talked about on the forums. Also found this: http://www.raspberrypiforums.com/forum/viewtopic.php?f=5&t=150 don't know if that is any help ?
Thanks for the reply. I decided to create fresh 3D models that have more detail. Models can be downloaded at http://www.tronetix.com/joomla/index.php/projects
Models for Alibre2012, 3D PDF, Sketchup, Solidworks, Step214 and STl are available for anyone who wished to have a pretty detailed 3D model.
It was based off a Sketchup I found but there is ~4mm difference in published board dimension than with the Sketchup that aparantly RaspberryPi people must have made.
This version should be the most accurate to date. Any dimensional errors, please let me know and I'll update.
Anyone have access to generating either an IDF (emn, brd, ifl etc ) of the Raspberry layout so I can create a quality 3D model of board while waiting for delivery? I would post freely a finished 3D model in multi formats if I could simply get an IDF of the design. The lack of mounting holes is going to make packaging challenging.