ORIGINAL: MinnFlyer
While GGoldberg makes some of the best designs ever, they don't have the most accurate plans. Just build the ing with the ribs 90* to their trailing edge notches and you'll be fine
Kind of like building a BUSA, the drawings aren't exact. When you cut out the parts and pin them to the plans- most parts don't fit exactly to what's drawn on the plans. CAD drawings I heard are more exact.
Again RCKen said it best, you're OK.
Pete