Minecraft 1.8 - Iron golem farm questions on spawn rate and efficiency

So I've been building this thing, to see how it works and if I can increase the efficiency some:
Now, I tried to increase the number of floors, but it's hard to determine the effects of it. Some times it seems as though the whole thing is broke as well.
I have one pouch of villagers on either side, dont't know if that affects anything though.
So my questions to this design is:
Is this thing considered as one, larger village? Or two separate ones? How far away (vertically) does the next layer need to be for it to be recognized as two separate villages?
Here is the other one, which I have extended the length of:
And my questions to this design is:
Does increasing the space, doors and villagers increase the chance of iron golems spawning? Or does it just increase the cap?
Best Answer
As far as my understanding of villages goes there are three factors with your design that my impact on your design.
Villages are measured in doors. With the mean centre being the mid point for golem spawning which happens in any empty space within the given radius. Thus with your design it would be my expectation that some of the iron golems might spawn under the structure (again not 100% clear on this as working from memory here). Even so the spawn rate is never massively fast and needs a leave it and come back approach.
Farms would normally need to be 64 blocks apart - so 64 blocks straight up in your design. However if the centres share the same vertical coordinates then they need to be 66 blocks apart according tot he wiki.
Other designs that have seen that place the villagers on the outside place them on all four sides. This would seem to be to force the spawns to happen between them. If you are up for a little experimentation you might find you get different results.
Your question about doors: Doors do not increase the spawn rate but do increase the village cap. (see quote below).
Golems will spawn in a 16×16×6 area, centered between the 21 or more valid doors in a village if it has at least 10 villagers. The chance of spawning is 1 in 7000 per game tick, which averages around one every six minutes. Iron golems can spawn provided the blocks it spawns in are transparent and the block it spawns on top of has a solid surface. --http://minecraft.gamepedia.com/Iron_Golem
You probably know that you can see other people's designs here: http://minecraft.gamepedia.com/Tutorials/Iron_golem_farming
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How do you make an iron golem farm more efficient?
Short answer: Iron golems attempt to spawn at the "village center", but due to the current setup there isn't room for the golem at this point. A village center is the northwest bottom corner of a point-of-interest (POI) block, which can be a bed pillow, bell, or workstation.Testing Iron Farms in Minecraft - Which One You Should Build?
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