Do the numbers for sure but in the case of something like this with the canards and all you cannot do better than to test it with a small all sheet balsa glider. Something in the 12 inch span range with a simple 1/16 surfaces and 1/8 fuselage. Test glide it and trim the elevons on the main wing to flatten the glide with the CG at various test points. Start forward and keep working it back until when you toss it the nose does not come up with the extra airspeed. That will be pretty close to neutral. Move it back a bit more and you should find that it can't be trimmed for a simple glide any more. The last spot ahead was very close to the neutral point. You don't want the larger model to have a balance point behind that and preferably a 1/2 inch to an inch in front of it would be best.

After the CG testing you hang it up over your workbench as inspiration. Felt pen decoration is optional but highly recomended. [8D]