The order of the court approving and confirming the assessment and declaring the proposed work of drainage established shall be final and conclusive, unless proceedings in error therefrom to the supreme court shall be taken in the same manner and under the same condition as provided in this act for taking proceedings in error from the judgment and orders of the court on the preliminary report of the drainage commissioners. If no proceeding in error be taken from the order of the court declaring the work established, or upon the judgment and order of the court being confirmed by the supreme court, the court shall by its order instruct the drainage commissioners to proceed with the work.