No, I can't post the part unfortunately.
However, I think the problem is in those places where the thickness actually goes to zero or where, for example, a ray disappears as 320i s said.
I tried and I can thicken it 0.11 mm, at the minimum of capitulate, creates the shell but then it is practically unusable apart maybe trying to figure out from what the errors are....
more than else I was wondering: I have sometimes seen using the shell function (which btw does not find in my creo 3), since I have the outer surface, I cannot fill it and then find the way to empty it? But in fact I don't even do the offset of the union surfaces that I created.. .