Reassuring to know there are still people that know how to do it! I once made about 6 of them, in a nice big warehouse, loads of space to knock them up, then went to mount them on the windows, (in another room) and couldnt get them through the door!! Had to redo the lot!!
we fitted a t&b frame to an outbuilding window a couple of weeks ago, hardest bit..finding insulated staples!