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need some help with solidworks homework


I'm an industrial design graduate student and I have some homework I desperately need some help with.
I'm was given a part from an esambly which I need to build it in reverse engineering. I managed to do most of it, but have some problem with the bottom of the part. it seems to me that I should build it with shell and ribs, when I try to apply shell it tells me "The Thickness value is greater than the Minimum radius of Curvature. The shell may succeed, but could cause undesirable results, such as bad geometry. To find the Minimum radius of Curvature, use Tools, Check." I'm lost..tried many things, but don't know how to do it. :rolleyes:
thank you!

(by the way the part is a slider of a jig saw)