I asked him the same question before. This is what he said:
"I used Duplicolor's high-temp engine paint (color: cast coat iron)"
Thanks. Definitely have to keep this in mind as an alternative to the stock silver color.
As to the original post about cleaning up the triangle, I found this site a while ago.
http://www.motofiaccone.com/moto/39-cb360-cafe-racer/88-hiding-cafe-racer-batteriesThe gentleman relocates the battery(not unusual), but this guys uses three small 12v batteries. The look almost like R/C car batteries. I don't know how it would work for a larger bike like my CB750, but I bookmarked it cause it might be something that I want to try. Pictures of the battery are kind of fuzzy, but I believe they're 12v .8Ahs (ABS 12V0.8T5LT) which would give a total of 2.4Ahs(I think).