The idea of folding gate hinge out riggers is one I saw in a small boating magazine called 'messing about in boats' (MAIB), I just adapted it to a Coleman canoe. It can be done to any small boat that is rowable, however you don't want your oarlocks more than 4 feet apart, for ease of rowing. (I have read some people say up to 5' is ok, not for me though)
I have been rowing my Coleman canoes for 5 years now, the pictures of the red canoe are from the second canoe I modified, the first (green ) was returned to my dad as it was his. He just paddles the canoe now and the extra hardware and outriggers don't interfere at all, in fact he doesn't even notice they are there.
As I have the canoe set up here it is intended for at least one passenger in the back, otherwise you will need almost as much ballast as you weigh, as your weight is ahead of the center of the boat. For easier handling and speed you want the stern of the boat to be an inch or two deeper than the bow, otherwise the boat tends to 'spin out' without constant attention. My wife and kids make perfect ballast, and when she wants she paddles for speed or exercise.
I traded a 15' canoe I bought that same day for the 17' canoe, both canoes were found on CL. (craigslist.org)