After many trials and even more errors, I have a fairly acceptable Gold Bonnet B unit - a former PRR B unit. Apologies for no more info now, but I'm in a real bind at work and will be putting in about 50 hours this week. It will probably be a week or so but I promise to post a long discussion with photos and the details of what paint I used and such, and the results - warts and all. But it looks good - not factory perfect but better than I feared it might, two weeks ago when I started. A lot better.