To start on the cab I first cut two rectangles out of .040" styrene to size. I printed out a scale drawing of the cab, cut it out and used it as a pattern for the roof curve.  Once those were cut, I cut out the openings for the windows.

Rivets were embossed in .020” styrene and the cab was assembled.   Doors were made from styrene strips.

The inner roof was created by applying some .040” styrene strips perpendicular to the curved front and back.

The roof was made from .020” styrene cut to shape and embossed with rivets.  I glued it to the inner roof using contact cement.

The edge was finished using some .060” half round styrene.   I added a rain “gutter” strip, and a roof hatch.

A fire door was obtained from Ozark Miniatures (left), and the backhead came from the Bachmann 10 wheeler.   I added some rivets using textured paint.  I built a “step” that is used by the fireman to open the doors.  Grate shakers (3 on each side of the door) were made from styrene strip.

Above right, I used the Bachmann air tanks and attached them to the floor of the cab using some 1/8” x 1/64” brass strips.