My family and I are doing just that! We picked up EATING a vegan diet a little over a year ago. I hunted and was raised on a farm till i was 18 when i joined the military. I'm 25 now and have met some great people that are doing great things with a vegan diet so I figured I'd give it a try and so did my wife. What you are talking about is exactly what we are wanting to do when I retire. Right now we are in the process of incorperating permaculture and homesteading into our semi-urban life. So far we have recieved 8 chickens and are currently looking to rescue around 2 rabbits. We live on a little under a half an acre, in a neighboorhood where having these things are little frowned upon, but if my kids want animals... I'm going to make it happen. We are setting up an aquaponic system and finishing up our chicken tractor this weekend. Though it will be quite some time before we get to have the permaculture homestead of our dreams, we are planning on do as you described in the future.
Here's a link to the YouTube page that i have started. I wanna have it up to share and learn from others.
http://www.youtube.com/user/ParksAquaGreenHouse