if the new wing is a semi and the first was a flat then your wing loading will be higher and thus the plane wil be harder to fly. (nasty #2)
if you have the plans then you can cut new ribs and build the exact same wing. scratching off plans isnt as hard as it is made to be. how you tink they did it before di cut and laser cuting was availible?

-edit-
wow, i wasnt thinging all that well when i chose my words on this one...