Good looking jet. The saying goes: Nose heavy jets fly poorly while tail heavy jets fly once. Ballast the model to the correct CG with the aft tanks full. Drain the tanks and see how far the CG shifts farward. I'd taxi it with the aft tanks empty and see if you can get the nose to rotate then abort. If the nose wheel will come up- it'll fly. You might consider a tank in the front and back feeding through a tee to the header.

Mike