I think I'd take precise measurements of outline dimensions, rib placements, and structural piece sizes, then "slice off" of each rib on my bandsaw for the rib outlines, making each slice maybe 3/16 wide or so. Leave all the sheeting and spars glued in place during the slicing operation. Once in possession of the gross outlines of a particular rib, the adjustments for sheet LE/TE/capstrips/etc can be penciled in later befor making the template(s) you'll be cutting from.