Copy. I'm aware of the differences. The plans I have from the Model Boats Plans Service from the 80's (by John Pritchard) are much better than those supplied in the kit, so my model has been built accordingly. These plans have been supplemented with information from the Manitoba Naval Museum here in Canada (right in the middle of the country, in the Canadian Prairie!!!), along with the Internet. I'm looking for more detailed information on things like the exhaust muffler system and linkages, and other assorted upper deck fittings, as these have been simplified in the kit, and the scale is too big to ignore them, so you're book may be just what I'mm looking for.