The control booth is basically a 2 inch square box. I used 40 mil thick styrene laminated with Plastic corrugated siding. The railing is HR-8. I added a small control booth to the inside and made the door a sliding style as shown in the next photo.
I decided to attach the control to the super structure so mad a small platform from 40 mil sheet stock and glued it to the side assembly. The gantry crane is basically ready for paint. The customer wants dark gray. After painting I will attach the cable hook.