This idea started with a friend who wanted me to recess the baggage doors for the brass car sides to mount on a ConCor body. That wasn't too hard, just chop/cut out the brass door, then remove enough plastic car side to make a recess, and glue door and sides in place. That worked out pretty good so next project I cut out a diner's doors and soldered two-piece (dutch door) doors to the back of the brass side for a slightly recessed door.
That led to this project, a GN Big Dome conversion of the Bachmann car.
There are three layers of brass sheets on a side, matching the arrangement of the prototype.
You need two sets of the sides, one as the base and the other, cut up into segments, as the separate layered pieces.
Soldering wasn't that hard to do, I did have to cut out centers in the base plate to get the solder in behind the overlay plates.
Once this car is assembled and painted (Big Sky Blue) the sides should really look good. Unfortunately they will be riding underneath that big toy-like Bachmann dome so that will diminish the impact.
This car would look awesome in the Empire Builder paint, and I'll probably make up that version next since this wasn't a very hard project, just time consuming.
Most brass sides are OK as is, but modifying the ones with different layers certainly makes those cars look better.