LOW-COST VILLAGE HOMES: Eleven houses, available under Section 221 of the National Housing Act, are in advanced stages of construction on Clark Rd. in the western section of Willow Village. Other houses in the 373-lot Washtenaw Concourse Subdivisions are also under construction. The homes, intended chiefly for families displaced by the demolition of wartime housing in Willow Village, are being sold for less than $10,000 on 40-year mortgages. More than 80 families have already made deposits on the low-cost homes being built by the Willow Woods Development Co. as part of the redevelopment of the wartime "Bomber City." The first 50 "221" houses are expected to be completed before Jan. 1.