That looks like really good way to do the rudders. I just can't imagine flying a bird this size without rudder. And with the style of ailerons you have, you may need to coordinate with rudder in the turns to keep the tail from dropping. But I think you will also need it on take off to control the model, as it rotates, and the nose wheel leaves the ground. They will be worth any amount of time and trouble needed.
The model fuselage a lot better in the pics you posted than the ones on the website. I was really turned off by the website pics, because the model looks so "skinny". It looks much more "beefy" in your pics.