Thought I'd show you I was working on over the last hour or so.
I have one of these at my in-game house, but you can't use it due to land permissions.
Either way, without further adieu, here it is;

Usage:
If there is grass, make sure you have no bonemeal or seeds in your inv. then, grab ONE bonemeal, right click the seeded soil, and it will break the full wheat, dropping two seeds. The left dispenser will then give you a seed, plant and the right dispenser will give you a bonemeal. Rinse, repeat, once you've got enough, hit the lever and grab the loot.




There is also a glass version just next to it.

This is located;
Just off spawn









