Minecraft gold farm above bedrock in the nether

Minecraft gold farm above bedrock in the nether from Youtube by Alex Diener, 98,439 views

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Description:
Update: Confirmed working in Minecraft 1.7.4. Anvil format maps in Minecraft 1.2 gave us twice as much vertical building space, but the nether is still only 128 blocks high. What can we do with that empty space? This video shows how to get through the top bedrock layer in the nether, and demonstrates a concept for a high efficiency gold farm built at the height limit. World download: http://ludobloom.com/temp/ThemsAllTook_SSP_2012-11-04.zip