I have a part file with two imported surfaces of a propeller, one of each side of the blade. There is a gap between the imported surfaces which needs to be filled. I'm trying to merge the two surface imports and make a solid propeller model to run a static simulation test on it. I've tried knitting the surfaces and boundary boss/base, but both get error messages. I'm currently trying to loft the gap together, but there's a lot of edges to match up. Hopefully someone knows a better approach to getting a solid model with the geometry of the propeller blade. Attached are screenshots and the part file.