California Forever’s plan to build a new city in eastern Solano County could include the development of a major shipbuilding operation on 1,400 acres near the tiny town of Collinsville, according to multiple people familiar with the plan. A shipbuilding operation would mark a sharp departure for California Forever, a controversial billionaire-backed development group that has spent more than $1 billion buying up over 50,000 acres in Solano County. The group’s ambitions include developing a city