If I am correct, then the issue here was that the Nvidia installer couldn't find the kernel source code. So for the benefit of anyone else you might wander in, there are several command line arguments that can be run with the Nvidia installer.
Run the following to see a list:
One of the arguments is to tell the installer where the source code is for the kernel that is running. For example, I keep my kernel source in /home/brian/kernel. So the last time I built the Nvidia driver for my custom kernel, the command I used was: