The way I'm reading it, those rib don't necessarily have to have a draft to them (+0 callout) but CAN have up to a -30 degree draft SO LONG as the minimum thickness does not go below 0.12 inches.
If this is the case, then the parts are out because the min is more like 0.06 inches.
But, maybe they mean just the base has a 0.12 min and then can get thinner as the draft tapers it down?
On the CAD model our company has, the ribs have no draft whatsoever, and a thickness of 0.12 inches.
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