bugdevheli,
How many and what size and degree of twist would you like?
This would be open to a consensus.
An idea that was considered a few year ago was to produce a female mold (two if the blades are to be asymmetrical) to produce the outer surface of the blade. This mold would have a taper and probably a twist. The mold would have a span that was 3 or 4 feet longer than the longest blade. The root chord of the mold would suit the root of the largest blade and the tip chord of the mold would suit the tip of the smallest blade.
Blades could then be produced at any location within the extra long span of the mold. The different blades that were produced would have to have the same taper and twist but their length and chord could differ.
Dave