I will be obviously be painting the inside too, but had a question.  Do you tend to paint the whole inside of the cabinet (which wasn't how it was done in the factory), or just paint the inside walls with a bit of overspray going down towards the bottom of the cabinet?

Or does it tend vary depending on the condition of the cabinet?  If it's pretty rough/dirty and dinged up needing repairs on the bottom or lower inside walls then I imagine this would push you towards completely painting the inside the factory colour?