OSHA Barricade

Need a designer who specializes in mechanical design. Need design for a OSHA compliant barricade that is made of aluminum and has removable front crossbars. Barricade protects against open vertical building shaft.
Barricade has theee 4” wide crossbar rails, top=42” above floor, Midrail =21” above floor, bottom = slightlighy above floor to serve as kickboard.

The barricade extends 4 feet on each side from the wall. The sides of the barricades include a swinging gate that self latches and has a latch with a handle.