Other conventions of Wheelbuilding
A good wheelbuilder will ensure that the valve hole lies between two nearly parallel spokes to ease attachment of a pump head. This does not affect the structural integrity of the wheel, but it is unusual for this rule not to be observed.
It is also a convention, if the hub has a maker’s label on its barrel, for the label to face (and be readable through) the valve hole. The rim labels should be readable from the right-hand side (drive side) of the bicycle. The hub labels should face in the same direction front and rear (generally so they are readable from the seat), this means that even an undished, symmetrical front wheel has to be laced to the rim the “proper” way round, if perfection is the aim.