it is looking very good. I'm always working with spline cages, as it lowers the times you have to mess with the mesh because of errors in the print. With a spline cage you have a 100% fit so there for it's easier to make the mesh look good. I've done it on the camaro and the murcielago and they took both for about 8/10 hours to complete. But i can tell you it's worth it
the modelling goes faster, easier and is more fun as you don't have the frustrating prints.
good luck and the spline cagei s looking really good!