WINSTED, Minnesota — Littfin Lumber, one of the leading Midwest structural building components manufacturer, has been acquired by Canadian building components manufacturer All-Fab Group and its private equity backers. …Littfin is one of the largest manufacturers of roof and floor trusses in the Upper Midwest. The company serves professional lumberyards throughout Minnesota, western Wisconsin, the eastern Dakotas, and northern Iowa. All-Fab Group, based in Winnipeg, Manitoba, is a manufacturer of structural building components. …The All-Fab Group is one of the largest independent building solutions providers in Western Canada, serving customers in both Canada and the United States.