Wooden Boat #45 has an article by Maynard on the Bar Harbor 31. Towards the end, there is a discussion of HMCo framing. Apparently, the company frequently used both sheer clamps and hanging knees. In the BH31, there are 6 pairs of knees. If you study these images, it appears that the hanging knees are cut so as to fit around a stem-to-stern sheer clamp and placed every 3 or 4 frames in the salon area. Foreward, there don't appear to be any knees. You can also see a few butt blocks, cut the way HMCo did with chamfered inboard horizontal edges. This, at least to me, is looking more and more like an HMCo boat.