22. Extrude the highlighted edges (Fig28) and snap them to the guide curves.
23. Continue extruding, cutting in detail and snapping to the guide curves until you get a similar surface to that shown in Fig29. Remember to sight down rows of vertices and adjust accordingly to keep a clean flowing mesh - don't let this consume too much of your time though, because we will address any major issues when we smooth.
24. Now select the edges highlighted in Fig30 and extrude them.
25. Select these new faces and Extract them, then snap them to the curve to get something similar to Fig31.
26. The next few pieces are fairly self explanatory and just use a combination of the techniques already used. So I will just show screen grabs for each new piece of geometry so you can see the poly flow.
The front panel (just under the front lights) can be seen in Fig32.
27. Fig33 shows how the front bumper was created. Just remember to use your guide curves and build up detail slowly and evenly. I'm not sure if I'm 100% happy with the geometry flow, so I reserve the right to amend it in the next section if it doesn't look right with a smooth and bevel.
28. The front fender is a little bit tricky, so pay attention and build it up slowly. We will start with a ring of faces to outline the wheel arch (Fig34). You should have two curves outlining the wheel arch, so snap to these.