Do you have a build record already? It might be easiest to walk you through an actual record.
Old Town canoes were built in three grades and many models. The grades are AA (top grade, with mahogany trim), CS (common sense grade, with hardwood trim other than mahogany), and GS (guide special grade, with less attention made to the surface finishing of the canvas part of the canoe).
I'll attach a couple pages from an Old Town catalog which explains this, with information courtesy "The Complete Old Town Canoe Company Catalog Collection, 1901- 1993", available on CD from
http://www.wcha.org/catalog/ and
http://www.dragonflycanoe.com/cdrom.htm on the web.
Going over the specifications of the various models might require a book-length reply. There's a nice book already, "Old Town, Our First Hundred Years", by Sue Audette, that may answer some questions.
Some popular OT models are the Otca, the HW, the Charles River, the 50 pounder, the Guide and the Yankee... but there are others and it's easier to give information on a specific one, if you're interested in a model in particular.
Feel free to ask for more specific information or provide a serial number and we can look it up.
Kathy