I don't think it will work particularly well. I originally planned for that, but bought the dinghy, built a mockup, and decided it was all wrong. Here is a video of this arrangement on a Jeanneau 57: http://youtu.be/Gp5LP-oP7EA

Compare to mine: http://youtu.be/hc5c7mMlUIk

Note that the motor must be removed, which is half the effort. If you try to spin the dinghy sideways with the motor on it (even if there were room to do it), it is MUCH more difficult than what's shown in the video, because the CG of the combination is very near the transom. When you try to turn the dinghy, it wants to spin around the transom rather than the middle and is very awkward to handle. About twice as heavy with the motor too. Tailheavy enough that the bow is going to want to go right over the cockpit on that winch. They really should try these things before they build them.

Here is what my garage mockup looked like sideways:

And here fore-and-aft:

Though I settled on putting it over to port rather than starboard. I dragged it in and out of that mockup a bunch of times several different ways before we built the boat. That compartment has to drain at large angles of heel as well, which is why I have the sloped surfaces to the sides rather than having the dinghy deck go right out to the hull shell. It looks to me like on the Jeanneau you could end of with a lot of water in there at 30 degrees of heel. And their electric jack would be drowned (mine is up under the deck). Here is testing the drainage of the dinghy deck at 30 degrees heal: