Cs-Cart 4.x.x Add-On

Project needs to be done in 3 days. We are looking for a developer that can create an add-on for Cs-Cart 4.x.x Need someone with experience in Cs-Cart 4.x.x Simple but tricky. Bulk order add-on function: - We want 20 sales to complete in a certain time margin. - Once 20 sales completed, order closes. - Need to show list of users that bought the product. - Orders completed and orders left Please see attachment for further information.