It's still 40 below (Centigrade) here, but I made an exception and took some bad photos with my phone. Let me know if this is overly confusing and I'll try to fill in any blanks.
First, the whole setup. The arms pivot at the front, and are long enough to not noticeably change thrustline. The hook at the front of the lift is to latch the motor up with the extension arm, which fits into the lever on the starboard side at the foremost crossbar of the lift. The attach is a stub of pipe, and the extension is a rod which slides inside this pipe, now sandwiched in a nice spruce limb by way of hose clamps. Everything it tied in the "motor fully down" position in these images.
The front pivot point and aforementioned latch, see from the inside of the canoe just above the gunnels. I would recommend something more elegant for the pivot - perhaps a tie rod from a small car - as the simple pin and clevis rattles and shakes and bangs, but does work.
A closeup of the working parts. There are 4 pivot points in the system:
1) The bars at the front, shown in an earlier picture.
2) The forward crossbar, attached to the boat on pivot points. This has a pair of rearward-facing bars welded solid, which engage (3), and are not visible in the first photo.
3) The aft lower crossbar, somewhat visible in the second photo below. This is a free-floating, and connects (2) and (4).
4) The aft upper crossbar, which connects to the lift and to (3) via welded pipes.
Depressing the lever (clearly visible in the bottom left corner of the first photo below) rotates (2), raising (3) and therefore (4) by way of straightening the connection between (2)-->(3)-->(4).
The motor attach plate, seen below from the stern, extends below the original transom of the boat as to exert thrust where it was originally intended to be when the motor is fully lowered, which it is for most operations where very much thrust is used. Up is to the right of this photo. A wood backer gets everything to 2" or so thick under the motor clamps.
A tiller extension is used (hunk of wood maybe 3 feet long, which gets hose clamped to the tiller), and I sit on a small Action Packer somewhere in the vicinity of where the arms pivot. In shallow water, I almost always stand - it's just more comfortable that way.