I have a 1963 Bill Brigden M2 canoe in for some repair work.  Usually all I get in are the M3s.  The M2 has a bit more of a shallow "V" bottom to it, much like the Mad River Canoes had.

This canoe also has inner and outer gunnels, the M3 had outers only for quick water drainage.  The M2 has inners of Spruce and outers of White Oak.  The flotation is still chunks of foam shoved into the bow and stern, the bulkhead is still a piece of varnished 1/4" Fir plywood with a gob of resin as a hold at the bottom of the canoe.

The deck is a piece og galvanized sheet metal.  On the M3s this would be screwed to the top of the gunnels, but on this M2 it is held below the gunnels by compression of he foam against the deck plate.  This required me to do a bunch of fitting to get the right angle and just the right amount of pressure.  The deck has its exposed edged folded at right angles forming a hook which holds the bulkhead from flopping all over.  One last bit of reverse engineering was to figure out what kept this whole arrangement from falling apart.  More of this later when I get it together and have photos.