A few weeks ago a letter was posted on the ModelWarships.com site from an Edward Zimmerman who says he is the "founder/President of the USS United States Foundation." Most of the letter is a very strident complaint against Revell and Monogram for their smaller scale Constitution kits that have been released, unmodified, as the United States. The one exception he makes is for the Revell 1/96 issue, which at least made an attempt to represent the different stern configuration. His letter states in part:
"In, or about, the year 1976, the Revell model company produced a 1:96 scale version of the frigate USS UNITED STATES, designated as kit number H-396. This kit had a roundhouse and poop deck with a balustrade on the stern of the model. This structure was witnessed on the original frigate by the journal of First Officer, Lt. John Mulowney; by Nathaniel Parker Willis in his "Summer Cruise in the Mediterranean"; by Ordinary Seaman and "Moby Dick" author Herman Melville in his "Journal of A Cruise...In the Frigate UNITED STATES", and by USMC Cpl Edward W. Taylor in his journal "Pacific Ocean Campaign 1842 - 1844". The structure was well documented and known as "lofty" and it could hold as many as two quadrilles of dancers. A well known author on naval architecture, Howard I. Chapelle, has also recognized the roundhouse, poop deck, rail and drift on his drawings "on UNITED STATES only". "
The entire thread can be read here:
http://www.shipmodels.info/mwphpBB2/viewtopic.php?t=16110
The as-built profile of Constitution in Chapelle's History of the American Sailing Navy does show dashed lines representing a raised poop with railings and two-level quarter galeries for United States. The railings Chapelle draws are much lower than what is depicted on the Revell model. Unfortunately, there is no plan view.
There is a plan view of the United States' spar deck in Donald Canney's Sailing Warships of the US Navy. Dated "1830's" and drawn at the Charleston Navy Yard, it shows no poop deck at all, only small curved-wall structures at the corners of the stern inside of the quarter galleries. These look like they could be enclosures to allow continued use of the upper level of the quarter galleries as heads. The lack of a poop deck in the 1830s would, however, be in direct conflict with Melville and others, unless it was rebuilt at a later date.