Hey Rick, a couple of things now that I have had some time to think on it...
1. If this is gonna be a true survival knife, I would do away with the saw on the back of the blade, as it would get in the way of battoning through anything (this is the main method used for cutting through large pieces of wood, if ya didin't know already!!).
2. How thick will the knife be? Again, for a survival knife, I wouldn't go less that 3/16th of an inch, as this will allow for really good toughness.
3. Thinking about diferentialy tempering? It would be a good idea, as this should increase the toughness and durability.
4. The incorperation of the seat belt cutter is a fantastic idea!!
For whatever it is worth, that is all I have for now!
I really like the big belly on this one!
Frank B