I included my download link for my second model in here. So if you want to, try that out.
DOWNLOAD

If you want a auto-cobble house, you're at home! You can download one here.

Yup, it's fully automatic (Except for mining with a diamond or BUTTER pickaxe). Generating Cobblestone. Finally. I did a search on Google, and couldn't find a legitimate automatic cobblestone generator, so I made one instead. Obviously, it's not very compact (and I definitely could do much better), but I don't have the time, and want to post a project since I haven't done so in a while already. So here it is.

I started it in a flatland world, and took all the pics there, but I decided it was boring, so, I used world edit to move it to a hidden place....

I saw a chicken riding the minecart when I was building it, and thought that was hilarious. and a spider. and slime. And now, there's a mosquito biting me at 10 different places at practically the same time. I just can't find the time these days, since school is starting in 2 weeks, and they're planning to throw my cousin's birthday party at my own home, since it's the bigger than theirs (but also more than 3 times smaller than some of my friends).

And if you download and start mining, you might notice a way to make an up/down piston elevator. Might.

Additional Notes

You may spawn at a different place than I intended, thanks to a 'bug'. If you do, look around for a sign that says: "t3ach's auto cobble gen.......". It has a piston door, but utilizes a stone pressure plate, which gives it away.
Also, I'm thinking about releasing a more efficient generator in the near future, but in the meantime check out some of my other stuff.