OK, I got it after reading that a few times, and now I'm on to the next step. Thanks!Franks right of course, to much geometry, and you have multiple
vectors converging on a single point at the end.
Although I believe it can still work.
Try these tricks with the Inner Extrude tool to avoid overlapping geometry.
Zoom in on a tight meshed section of the object when you use Inner Extrude.
Don't drag, just click and then scale with the Transform Tool.