The images below are examples of radius parts - in each image, the top part represents how it was modeled (ensuring it would "nest" and fit on a sheet of material) whereas the bottom part represents how it was analyzed. In each case, the analyzed parts were "too big to fit" on the available sheet size.

It appears that the analyzation is looking for a straight edge and then basing the part size by rotating the straight edge to be 90 degrees and analyzing the extents to create a rectangular part from which it will cut the irregular shape.

Users would have far more success with the Solid Model Tools, especially when working with irregular-shaped parts, if the analyzation process would look to vector points and rotate based on those points to create smaller rectangular parts that will nest without issue.