Chicken Tractor Plans?

Try this link and look at the Garden Ark.  The plans aren't free, however I saw this today during the Portland coop tour and can tell you that it's a well designed tractor.  The designer had sample pages of the plans to view and they looked very well done. 

http://www.thegardencoop.com/

Here is a link to the Chicken Tractor Gallery.  Don't know if they have plans, but they have a ton of stuff to study so you can figure out what you want to do.

http://home.centurytel.net/thecitychicken/tractors.html

All of these tractors have plans or semi-plans:

Cluckingham Palace
Kycklingar's 4x10 Tractor
A Classy A-Frame Tractor
Chicken Tractor
Old Style Henhouse Tractor


There are more on the BYC coop section, but I chose these because they are either fairly simple to construct, or have relatively detailed plans. (Or both.)

Edit: What's the weather like where you live? What are the extreme temperatures for both winter and summer? How much building experience do you have? How many chickens?

I searched the internet for several weeks and couldn't find good, free plans that fit my situation.  I started looking at used doghouses on craigslist and got the perfect tractor-coop for $20.  I retrofitted it and the built my run myself using ideas from this site and the pics on: http://home.centurytel.net/thecitychicken/tractors.html
I wanted a coop that I could detach from the run and move each individually.  I also wanted wheels that were very stout so that I could roll the coop over uneven terrain and up/down slopes.  My coop is 4'X4' and the run I built 4'X10'.  I can seperate the two and close each independatly so that the birds can be locked in the run or in the coop while the other is moved.  Here are a few pics:








I also wanted something to move the chickens, so I borrowed my 2yr old son's green truck...now we have a chicken tractor and a chicken truck!

I had most of the lumber for the run, the coop was $20 and the 2X4 welded wire was @lowes for $35.  The tires (not pictured) are from Harbor Freight 10" pnuematic tires for $5 each!
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=30900

Check around for used doghouses, I think its cheaper and then you can tailor your tractor to your own needs.

http://www.backyardchickens.com/web/viewblog.php?id=70224-our-first-chicken-tractor

Simple and easy hoop coop to the rescue!
www.plamondon.com/hoop-coop.html

This is where I started for inspiration on my tractor. Check my BYC page here.
I has special needs due to 2 narrow garden gates. It took me a while and I am still fine tuning the design.

Some other questions would be:
How many chickens will you have?
What kind of chickens?
Will they be able to free range during the day?
Do you need an attached run?
Where do you live?
What kind of weather do you get there?

I'm sure the OP has housing by now considering the post was July 2009 and last post was Oct 09.

True. But, there are probably a few other people doing a search for chicken tractor plans right now.

Like me!

Love the last post, that's what I need...for a few months a year the creek gets low enough that I need something to let the girls out into.  Our neighbours have dogs that will surely kill them, but the creek provides a natural barrier 3  (of the nice) months a yr.

Thank you.