Keep in mind the specs you mentioned are minimums. For the ailerons, I would use one 645MG with a 6 volt pack. The same on elevator, 1/4 scale servo is too big and heavy. I have a 50% scale CAP that uses 2 5945's per elevator half so 1 645 or 5645 is adequate in your case. For rudder a single 1/4 scale servo would be OK like the 705MG. I would use metal gear servo's rather than nylon, they are much stronger. Use dual 6 volt packs for power and redundancy. As far as digital versus analog, the digital are more precise, center better and are not that much more than analog. Also you don't need the programmer it just makes setting up the servo's alot easier, especially when 2 or more servos are ganged to a surface. I have seen this plane fly with a G-62 (and depending on your flying weight) performance is marginal. You will be able to fly around but don't expect unlimited vertical or alot of power. For around $600 you can get a new ZDZ-80 which is a much better choice. You may be able to find one used call Mike at RCShowcase and see if he has anything available. Giant scale planes are an expensive hobby. Even a basic setup is going to cost you a couple thousand not including your time.