With my pathetic scribing skills, if I was in charge of the transcontinental railroad it would turn out like this

:

That being said, I applied a coat of primer, tried fixing the number of flaws, and then applied another primer coat. It's far from perfect with some detail being lost and a couple of areas that might need to be addressed, but aside from my feeble attempts at trying to scribe new panel lines or rescribe some that were lost in my puttying and sanding endeavor, the end result might be something that I can live with:

