So as farm as I am aware no-one has a very high efficiency mob farm on the new world. So I propose to make a very high efficiency one, however to allow it to perform at maximum efficiency no other Hostile mobs are able to spawn in a 128 block radius, so theoretically this would mean clearing out a 256 block square where no mobs can spawn and the easiest way to do this would to TNT it from ground level to bed rock. And then half-slab the top.
Then I have a design for a farm.
Unfortunately this would require a vast amount of work and a lot of TNT....

With the 1.5 patch this will be made simpler as we can then dispense TNT from a dispenser with the correct amount of TNT until we reach Bed-rock.

This would be a project I will would need permission form Broonie/Mod's and a project I would also not be able to do on my own so I would need assistance.
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Alternatively a witch farm could be set up if a suitable witch hut is available. Farming witch's can be farm more rewarding as they Drop: glow-stone, red-stone, bottles, gunpowder, sticks, spider eyes and sugar.
A similar setup would be required for a farm of this style however I'm sure many of you have seen a Witch farm already.

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So what I'm asking is: Do you think this would be a useful project?
Would you be interested in helping with this project?
Would you prefair a traditional mob farm or a Witch farm?
Do you know of an available witch hut?