The build record is a record of the completion of various components of the canoe... so, the dates your canoe was canvassed and filled, etc., are on the record too. However, a canoe doesn't need a keel and not all canoes have one. Some paddlers prefer a smaller canoe without a keel, because you can poke around in interesting little ponds and rivers a bit more easily. Back when the majority of wood/canvas were constructed by the major builders, a keel was usually added as part of the package-- and if a buyer didn't want one they sometimes had to pay extra.
Kathy