The "S" class has a very Edwardian wrapround roof, and these are a total swine to form cleanly, as brass and nickel-silver will distort in all sorts of unexpected ways. SSM/TMD try to make the job easier by making the roof eaves half-etched, but there is so little material above the cabside's curved cut-out that the whole lot will deform.
The instructions say that you should bend the top of the cabsides, using a 2mm rod to get the right sort of curve. This isn't quite as easy as it looks:
I tried to attain a clean curve by using a steel rule at the back:
....but the grade of brass in this old kit was a bit mad, and I found the task difficult to control properly. The following photo shows the extent of the problem:
As you can see, the offside roof eave is almost there, but the nearside shows signs of distortion, and it will need more work with the 2mm drill former to correct. At this point, I felt a bit like that episode where Father Ted is contemplating his "repair" work on the dent in the car that the Diocese gave for the raffle to raise funds to fix the Parochial House roof.......
"Ye know, ye're too much of a perfectionist, Ted...."
I call it the Eejit Guide to Building - 'cos when you read it, you can avoid the mistakes this eejit made