Well turtle way or not, at least it's going right! me and the the guys here in studio, just saw the intro of airborn and the gameplay video, congrats my friend! Really really good looking game! I am sure you will manage to finish it and someday I will be able to buy it, and play it! We are having hard times here with UDK and getting UE3 license, lots of paper work!
No, sorry, I never save them and always work on the same layers. Easier for me. Don't think theres much to learn from them. I work with mostly 3 layergroups and I use the lassotool for drawing the outline until I like it and then lock the opacity and paint in it. Good and fast way to work for me. Any special questions on my progress or did you just want to see it? Its not really special from other workflows.