Hey folks - seeking sagely advice. Building a set of wheels for an old friend. Mavic Open Pro 28h front and rear laced to dura ace 7400s FREEWHEEL. Spoke length will be between 300 & 305 from what I've calculated. Rider is about 135 -140. I'm thinking double or triple butted - opinions on this, on gauge in general, heavier gauge on non drive side, or am I getting crazy?