First, let me introduce myself. My name is Paweł Adamowicz and I am a student of Technical University in Łódź, Poland (Computer Graphics faculty). I've started my adventure with 3D graphics nearly 3 years ago, but it was no sooner than a year ago when I discovered Blender. I was struggling with 3DSMax before but it was painful and unsuccessful process - with Blender it went much smoother, especially, that there's plenty of tutorials on the Internet.
That's all about me, let's get back to the topic. This Ursus C-45 tractor was the first model which I made from start to the finish in Blender. As references I used some photos from the web and a crude side-blueprint from a hobby magazine. Later, I made the model a playground for procedural textures tests. I've also succeeded to prepare it for future use in animation (some constraints added to make the steering wheel affect front wheels and the turnout mechanism; the same made with the seat affecting the spring beneath it).
Please, do not hesitate to point out any shortcomings of the model.