Yes, I saw that, it looks fairly straightforward, and would certainly be a more efficient way of venting the rad, might even improve front aerodynamics.
It is very tempting to go down this route, the only thing holding me back is my paint colour, 3 coat Kinetic Mirage is going to be almost impossible to match up, I doubt I could have large back facing louvres stamped out of the bonnet without it looking a mess, and even boot type vents would possible be difficult to do on the bonnet sucessfully.
I've got some glued on louvre panels on my V8 MGB, a bit like the E type ones, but I'm not over happy with them, and I'm loth to mess up the TF's bonnet.