No code compliance considered, I don't know nor care if it is or isn't in compliance. (Clearances are OK though.) This was a temporary install to see how well it worked. You'd need backflow dampers if a permanent install for sure. When the stove is going pretty hot (surface temp around 500) the ducts close to the stove are too hot to hold your hand on for long, but at the plenum you can keep your hand on quite a long time.
Obviously a little 200-cfm blower won't have the guts to move large volumes of air, especially after running through a duct system--but I get 'feelable' (how's that for a scientific term!) flow at most registers, and the 1st and 2nd floors are a couple degrees warmer--basement, where the stove lives, is cooler. I don't think it's worth it though, the house 'feels' colder even though the thermometer says it's warmer...likely as a result of cooler floors. If this was a smaller, tighter house then things would probably be different.
Return air (and whatever radiant convection) comes from the basement stairwell--door is removed.
4x12 90 degree register boots feed 6" duct, through adjustable elbow, into adjustable takeoffs cut into side of furnace supply (hot side) plenum. One had two adjustable elbows to provide an offset.