I asked Paul Worsley about the rule concerning holes in shells and unless I misunderstood his reply it is basically
max dimension (on any plane) of a hole is 10mm, maximum material removal to total not more than 30mm to allow for removal on compound curves / unusual surfaces.
I still think it is a bit difficult to understand the rule as writen and suggested a drawing of what is acceptable would be useful (like they do with touring car wings etc)
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