Steve, it seems to be a problem if we demand the cross section to be rectangular. No boat are rectangular in every cross section.
Just for fun: Now i understand i may have understood the words wrong again. The rule does not say that every cross section must be rectangular. Maybe it it enough with one cross section to be rectangular? (Excuse me for that ;))
I think the wording peter made last opens for the builder to make shapes in a bigger range than today. Not much, but some. Maybe we should go for 1 degree. If some boat are 2 degrees off today it is illegal anyway and has to be corrected (in my interpretation).
Anyway, i like when we clean the rule from total errors. I think the intention to change this is fine, but not sure how. 2 degrees is ok by me, but to keep “rectangle” is not.