B unit conversion cab for a USA Trains GP7/9

Convert a USA Trains GP&/9 to a GP7B/GP9B

JTT products 97457 O Scale Tread Plate is a near perfect match. 

The porthole windows have a recess inside to accommodate the width of a standard Microscope slide or a (22mx22m) slip if you don't want to cut.

NOTE:  I PUT MUCH TIME AND EFFORT INTO DRAWING PARTS AND SHARE FILES FOR FELLOW MODEL TRAIN HOBBYISTS TO PRINT FOR THEMSELVES AND SHARE WITH FRIENDS.  PLEASE DO NOT SEEK PROFIT FROM MY DESIGNS.  FOR THOSE LOOKING FOR SOMEONE TO PRINT THIS, KNOW THAT THE MATERIAL COST IS ABOUT A DOLLAR AND 70 CENTS (Resin).