Window washer

I have just added a new sky scraper to my layout and want to add a window washer platform but there are no models for this. Can anyone tell me how to build a window washer platform.

Portland:

Here is my blind attempt to build a window washing rig. I say blind because I haven’t got a clue what the topside mechanisms look like so I used what little is in my own head. It is phosphor bronze .010 wire from Tichy Train Group, Rio Grande Models pulleys and Evergreen styrene extrusions. I have to add something to the rooftop structures to resemble counter ballance weights. This was intended to reflect 1950’s technology.

Sorry about the blurry picture - I still have not spent the money for a decent camera.

Dave