Is the Suntoucher CG too far aft?
Good catch! You are right, the center of gravity will be too much forward for a canard. If they put the prop on the sting behind the wing and the cockpit a bit ahead of the wing, things would look more credible.

The size of the foreplane is not obviously wrong, but the booms at the tips of the foreplane look strange. They serve no obvious purpose, like the sting, and the tailbooms look too thin for transmitting the loads from the vertical surfaces into the wing.

One third thing that looks odd are the control surfaces: The ailerons look too small to allow maneuvering in gusty weather at low speed. I guess the flaps on the inboard wing are for pitch control. Why are they not on the canard, where they would be more effective? Maybe because the center of gravity is so close to the foreplane, the designer decided to put them on the wing.

I agree with your assessment: This thing will remain an artist concept.

For comparison, see below a picture of a solar aircraft that actually flies and got most things right: The Icaré II:



Icaré II in flight (picture source)