A little semi-gloss black on the inside....
Started priming it and realized I used alcohol instead of Preps-All. Had a minor reaction....and then I decided, "Hey, this is a sweep the floor bike and that will match the patine on the tank just right!", so I left ot. Didn't spend much time sanding it at all.
Used some paint I picked up from the local hobby store (model car and airplane paint)....
....coated it with semi-gloss black, then the green....
...and then fogged it with the brown to match the faded tank. Topped it off with some clear.