Here's a plug for Open Source Ecology. One of their designs is for an Open Source tractor, made from inexpensive commodity parts. The advantage is the plans are

Here's a plug for Open Source Ecology. One of their designs is for an Open Source tractor, made from inexpensive commodity parts. The advantage is the plans are open & maintenance is also open. http://opensourceecology.org/gvcs/ http://opensourceecology.org/gvcs/