And if you go the old style hood route, a golfing umbrella is essential - it will cover very nearly the whole cockpit (or Management - your choice) while you erect the the hood?
Seriously if you are buying an umbrella don't buy a golf one, but get an
aerodynamic Senz umbrella good for up to 100 kph (and we've taken ours to much higher speeds!).
Saves putting up the hood...