Dred:
I have been building strictly from plans for decades. Not sure about your experience level, maybe you have been building even longer. However, sounds like oddball sizes for leading and trailing edges. What plane are you looking to build? Can you modify the ribs to accept standard sizes of leading/trailing edges? Are you sure the plans are accurate and the sizes you stated are indeed what you need?
Plans are usually loaded with errors. I used to think I was bad at building till I figured out most of the plans were wrong.