Leroy Zimmerman once restored antique tractors. Now he builds miniature versions of farm equipment to scale. Steve Zimmerman, left, and his father Leroy Zimmerman discuss the tools and methods Leroy uses to build miniature farm equipment. Leroy Zimmerman holds up a miniature version of potato harvesting equipment. He built both the model and original machine it’s based on. Leroy Zimmerman once restored antique tractors. Now he builds miniature versions of farm equipment to scale. Steve Zimmerman, left, and his father Leroy Zimmerman discuss the tools and methods Leroy uses to build miniature farm equipment. Leroy Zimmerman holds up a miniature version of potato harvesting equipment. He built both the model and original machine it’s based on. AMERICAN FALLS — From old siding, tin scraps and wooden blocks, Leroy Zimmerman assembles miniature versions of the farm equipment he and his father used to use. The toy-sized potato harvesters, antique tractors, plows and combines built to scale in his shop are so incredibly detailed, they appear to have been created by somehow shrinking real machinery. Zimmerman, who turns 89 in September, made all of his own toys as a child: He predomina...