Middlesex County officials say renovating the old Rappahannock Central Elementary cafeteria and auditorium into a community center could cost as much as $2.9 million. The building at Cooks Corner hasn’t been used in over 20 years. Supervisors approved drafting a proposal to hire an architect and determine actual costs. Two options are on the table — a lighter upgrade or a full gut and rebuild. The site is part of a wider plan to expand recreation at the former school campus.