Process Integration - Fabrication Innovation for 70 Years | WSoule mechanical contractor, custom sheet metal, millwright services, process piping, plumbing, Kalamazoo, Michigan, Southwest Michigan W. Soule is over 70 years of unrivaled experience, dexterity and skill that provide process integration, custom fabrication, power and process piping and millwright services. We are progressive problem-solvers who work as an extension of our clients� organizations to deliver innovative fabrication and implementation solutions for complex and unique situations. Learn more about W. Soule and our safety standards.