the schematic is the mob spawner and collector.
The schematic of mob spawner credit goes to the minecraft forums community for all the designs i used and learn from. Also its best to place the mob spawner on block 0,0 and it is made without cheats besides copying each floor on top of each other for better results.

Huge amounts of mob items full inventory in less then half a hour (just a guess)

Additional Notes

If someone would like to actually time how much items you get a hour be my guest.
Remember to put over block 0,0 and the opening where you collect the items is at the bottom of the map on the side facing you when you open it in mcedit.