Nice idea to make video tuts, here are a couple of things to improve your work/speed it up. This is not to flame you or anything, just my 2 cents.
Don\'t use a background pic, just put it on a plane for more control. Make your reference grey instead of white, easier to do in photoshop then changing the colors of max every time.
Editable mesh is fine and needed for the exporter, but it has its flaws, try working in an editable poly and at the end convert it to mesh.
In the transform window, rightclick on the arrows will instantly set it to 0.
Instead of mirroring the 4 parts and make them instances, you can also apply a symetry modifier, it automaticly welds the vertexes together.
I don\'t know your usual workflow, but if you want to speed it up a little goto:
http://www.3dimplant.com There are some very nice \"setting up your workflow\" tutorials.