I finished the installation and here are some pics.
I'm not sure about the range I have yet but it all works great! Good clear reception, no noise interference from the engine etc. I still need to tune the antenna with an SWR meter to maximize performance.
The final stage I am planning will be to run the coax under the carpet and up into the center console so I have no cables showing. There is already a power outlet in the console too so everything will tuck away nicely when I'm not using it. I'm pretty sure this is about as "stealthy" as I can get.