I am attempting to create a thermos with a handle. The thermos body and the handle need to be shelled to a certain thickness, but the face between the shelled body of the thermos and the shelled handle needs to remain intact to prevent liquid from going into the handle. This surface should keep the contour of the body wall.
I have attached a the part file for the thermos. To create the handle, I used a lofted boss/base with multiple sketches. I cannot seem to create the shell in the handle, though. I have tried the Shell command and have tried to perform a loft cut with inner offset sketches, but neither seem to work.
Any ideas on how to proceed would be greatly appreciated.