A wall of scaffolding now surrounds the historic Leigh Street Armory in Jackson Ward — a clear sign that work is under way to convert the 109-year-old building into the new home of the Black History Museum and Cultural Center of Virginia. About $8 million is to be poured into the building and a new addition. The goal: To create a visitor-friendly space where the history of African-Americans in this state can be told — from 1619 to the present. The museum, now at 00 Clay St., expects to relocate to the armory in the 100 block of West Leigh Street within a year.