From my looking at my BL II book the main differences that I see are in what is present on the deck which was not on BN decades ago; the radar on the foremast and life preserving devices tubes or possibly for inflatable boats; the entire lower deck arrangement of compartments as well as the forward entry into the large aft main cabin; the BN II engine, engine room, and dual propellers; air scoops just forward of the main cabin; lack of deck top storage provision for barrels, creates, etc. . for fishing; different dory kids p&s midships locations and launching/recovery tackle details; numbers of portholes around the main cabin; wider deck planks between the aft end of the main cabin under the wheel & box; square "tub" instead of round on the port side of the wheel box; and the general bow winch engine/gears/cover boxes; and type of bilge pumps. Just a quick summary of what visually comes across that I don't recognize from photos of BN as well as the plans for the MS2130 which are noted as to their vetting and counter checking for accuracy. I hope this partially answers your question. Rich (PT-2)OK, a question for all those familiar with the BL and BL2, how much difference in design is there between the two same named boats?
Could one buy two POF kits and use the second to make a BL2 to sit along side the original boat.