ok i think i have solved it, i forgot to - the matrix

Code:
  DrawLine(matrix._41-p0.x, matrix._42-p0.y, matrix._43-p0.z, matrix._41-p1.x, matrix._42-p1.y, matrix._43-p1.z);

so now this is sorted, the actual physical cube is drawn different to the rendered .x model... also the physics cube goes slighty through the ground/grass



Sample Here