Ize the wireframe is intentional. Yes. There is a issue with the offset. That is because Three.js [0,0] is in the center of the <canvas> and Construct2 [0,0] is at the top-left corner. And the FOV and Z position has to be calculated in 3D. All this makes the perfect position a little troublesome.
Edit: Oh yeah and Construct2 UP is DOWN in Three.js