MC Labs

MC Labs is a laboratory were you can test the most complex redstone machinery, as well as mob properties, and so forth. When the final product is released i will put up the world save.
It would be awesome if you guys could suggest some ares for testing.
Build List:
1.The actual lab:incomplete
2.Redstone test chamber:incomplete
3.Mob test chamber:incomplete
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*passive(cows,pigs,etc.)
*hostile(creepers,zombies,etc.)
*neutral(zombie pigmen,enderman,etc.)
4.structure test chamber:incomplete