Does anyone have instructions on building an outdoor wildlife proof feral cat feeder?

I have seen pics and heard of em, but no instructions.. Or can you buy one commercially?Does anyone have instructions on building an outdoor wildlife proof feral cat feeder?
Try this website:


http://www.neighborhoodcats.org/info/fee鈥?/a>





This could work for a feeding station:


http://www.neighborhoodcats.org/info/win鈥?/a>





There's downloadable instructions, too =)