This structure allows for the simple farming of raw beef and leather from cows without using a single redstone, in fact the hardest item to obtain would be the 10 iron for the hoppers, which can be acquired with relative ease.
More designs to come leave a comment if you would like to request a specific build, or if there are any ideas for builds you would like created.

-RyanTheBerry

Additional Notes

Other mobs usable within farm: horses, sheep, and mushroom cows