@ALL
Its 110% legal if u r not tempering or punching the chasis. 2ndly u hv to pay a certain amount of tax if the shape of the frame of the model changes...for instance Landcruiser 92 model frame is in a bit round shape as compared to 85-91 models which are a bit squarer..so if u swap a body of 92 model with the frame of any landcruiser b/w 85-91 then u hv to pay a tax in this case of Rs 90,000/= (will vary in different cases)....
I hope all confusion is cleared now