If you lift the side walls first and change those two walls, then you would lift the other two wall with floor joists ending above, to keep it level you lift the center beam too. Now your sides arn't sitting on the foundation because you just lifted the whole house. The geo-tech or geo-engineer is who at least here, comes out and measure the strength of the soil after it is dug out and tells your guy how big the footing should be. He should go over the plan and look for problems before you have a disaster.
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