I've built temp plywood decks at second floor level. With a ''hatch'' to get through. Leave enough space next to walls to pass whatever is needed up. Then you can just roll scaffold around. Don't forget curb at perimeter to stop wheels.
I look at the pictures again. Looks to me like four Baker scaffolds and planks. You can put the Baker on the stairs and still keep a level platform. May have to stack two on the lower flight of stairs.
I wish I had a camera years back when I build platforms in large custom homes for everybody to work in the stairwells. I would leave it up for all trades to use until they had to come down and everybody would help remove it for the use of it.
And a little too late, but they do have half baker sections. But they are hard to find and rental places may not carry them. One of our finishers had a set and they came in handy for those awkward stair set ups.
There was a special on those kind of baker racks. And since I already had a few. I bought one more set on sale and cut each side (ladder if you will) at about 2/3rds the height. So now I can either set up at one set high. Or 1 and 1/3rd high or 1 and 2/3rds high or 2 or 2 and 1/3. And so on. This comes in super handy in vaulted ceilings were one set is not enough and two sets reaches high points but puts lower section of vault at risk of being jousted/scratched especially when you are focused on rolling around something on the floor.
I have a 10 chop saw that I set up with a wood AND metal cutting blade (especially if cutting say used studs with nails) and it made a clean cut on each corner tube of ladder section.
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