This model is going to LOOK great when it's done, but aerodynamically, it might be a problem. A few things I am noticing on this:
The anhedral is going to cause an issue if you try to fly it that way, for a couple reasons.
First, anhedral will be severely unstable in the roll axis, because once the craft starts to roll, the higher wing will now suddenly have more lift than the lower wing, accelerating the rolling motion. This is why planes have dihedral, to counteract unexpected rolling.
Second, the anhedral causes the CG to be even higher in relation to the center of lift, which will cause the same unstable effect in roll, but now also in pitch. As soon as the nose starts to rise, the CG will shift rearward in relation to the center of lift, causing the pitching motion to increase.
That being said, I would still make the wings be able to rotate, because, well, that's cool! But I would only have them in the down position for static display. Flight configuration should be in a slightly dihedral position to get the center of lift even with, if not slightly higher than the CG.
As for control surfaces, I would not mix it with pitch control on both the front and rear wings. It will probably be too pitchy and hard to control. I would choose a canard configuration where pitch control is on the front wing and roll control is on the rear wing. That way both front and rear wings can be lifting surfaces. If you tried to use conventional controls where pitch is controlled in the rear, then the rear wing would need to be set at a negative incidence, and would not provide much lift at all, in order to make the plane stable.
Just my 2¢, but hopefully food for thought that will help reduce the hours of frustration trying to make this bird fly. I can't wait to see how you do!
PS, are you going to use any kind of flight controller to help with stability?