Scale models of plastics machinery drew curious show-goers to the Plastics Encounter booth of Thailand equipment maker Labtech Engineering Co. Ltd., which makes laboratory-scale plastics equipment. Technically skilled employees design and build each of the exact models to present to Labtech President Peter Jurgensen as a Christmas present every year. ``People are so honestly grateful for working there that they make these little machines,'' said Art White, of A.W. Enterprises of Coarsegold, Calif., which represents Labtech equipment in the western United States. ``It's not the management telling them to do it. It's from the ground up.''