A bit late, but maybe the following will help. It is from the original contract for her sister ship Aurora.
The Stern Post to be of good sound Oak timber of the best kind, free from Defects, square at the head 15 ½ ins, fore & aft on the keel the back or false post, if any, included, 2 ft 6ins abaft the rabbet, of the wing transom 9 ins which is to run up to bolt to the quarter deck beam, & on the Keel 2ft 1 in, not to have less than 11 ins Main Post abaft the Rabbit there, the Breadth athwartships at the head to be continued down as low as the deck Transom from thence to beginst tapering to 10 ins, as before observed that the main keel is to be wrought at that place, not to be bearded until the Back is on, & then to be no more than the tapering of the keel requires.
The Inner Post to run up to the underside of the Wing Transom to be 9 ins fore & aft there, & 11 ins on the Keel, to be of the same breadth athwartships, as the Main Post from the Deck Transom up, from thence down as the body requires.