Warehouse delivering hoist

Due to the board by board building method I am using for this model, which includes cutting the strips, painting them unevenly to look weathered, then cutting to length and gluing to the structure - one at a time.  After the boards are installed I use a single edge razor blade to scratch in wood grain.  That is all still in progress.  Meanwhile I have installed 2nd and 3rd floor delivery doors with a hoist at the top.

Below are several vintage photos of structures with delivery hoists.

I have tried to capture the look of these hoists.  The hoists employ an I beam extending from the top of the top doorway.  Inside is an electric motor to raise and lower the hook.