Vincent wheels should be one of the easiest to build, I've been building wheels as an amateur for 50 years but not had to do a Vincent one yet.
All the spokes are the same length and will only face one way in the hub, and the head can be inserted through the spoke flange, the only trick is keeping them in place in the spoke flange while putting the others in, plastic wall plugs are your friend here, inserted in the hole they stop the spokes coming out.
And the wheel is symmetrical, both sides are the same and equally off set.