I have to admit that the back of the veil is the part for which I have least documentation, but then, it is hard to find pictures of the back of any headdress. The only one I have found for the later style of English hood is Holbein's "An unknown English lady". This shows a box-like structure and two rectangular tails falling at 45 degrees. She is shown front and back, and the front view is identical to any other English hood.

There are two questions here: Is the back of the hood always boxed, and is the veil always divided into tails? I have decided no, for both questions. First, the veil. There are far more representations of French hoods than English, from the early Flemish tapestries to late Tudor effigies, and these show a development from a flowing semicircular veil to a tight narrow tube. There are also early church brasses which show a peaked hood with a flowing veil. I have decided to go with a semicircular veil, which I think is more elegant when worn down, and can be divided to flip up. As for the box back, again, it is not shown in the very early illustrations, and I have preferred not to make it.