Alright, I couldn't let it go. It's like blood scent for a great white, I guess.
Tested the farm on a creative world. Started building the farm at 192 height. I would recommend maybe a few blocks higher.
Roof of the doors ended up at 198. Added a second roof on top of the golem spawn which is 2 blocks over the villagers captured in the corners. The spire goes all the way to the max build height.
This structure would favour a box roof before making the spire structure. But I think we are at the right height here proportional wise as the main spire structure (cylinder) needs to be longer.
As you can see the farm takes very little vertical space. It takes only a very thin belt of the length of the scraper. Which is ideal for a empire state kind of building, which needs an indented center of the main structure down to the rectangular base.
From the ground.
As you can see there are two quite large open squares at the north east and the south west corner. Which could be roof access to the scraper. We should probably contain the visitors to those corners. 
Yeah... I used yellow stained glass.
I am really looking forward to the 1.7 update. Stained glass is one of those things that mincraft sorely lacked.
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