[PAID] Will pay for 3D drawing functions in Game Maker 2

Game Maker 2 has an OpenGL style 3D drawing library (see below). I set up some basic 3D drawing this weekend, but it looks like everything is drawing offset a little bit from where I expected (and I'm having a hard time figuring out why). I will pay for help fixing the positional problems and building the rest of the drawing API.

In short, I need to confirm everything is positionally correct and functions to draw spheres, lines, textured cubes and billboards. Someone experienced with OpenGl style 3D drawing should have no problem with this.

// example of opengl style drawing code:
vertex_position_3d(temp_buff, x2, y2, z2);
vertex_normal(temp_buff, 0, 0, 1);
vertex_color(temp_buff, color, 1);
vertex_texcoord(temp_buff, 1, 1);

Thanks!