This casting from 1962 is too old now. The flashing is excessive and the fit of many parts is poor. That is if you can follow the instructions, which are very vague and hard to follow without referencing photos. Some of the pictures are just scribble.
Some parts were deformed on the tractor unit possibly during manufacturing process or the kit has been in extreme temperatures, was going to purchase another kit but dubious now as they could be seconds, I have built the kit but it is not up to a standard I was expecting from Hornby