This act shall be liberally construed. Nothing contained herein is or shall be construed as a restriction or limitation upon any powers which the authority might otherwise have under other law of this state, and the provisions of this act are cumulative to such powers. The provisions hereof do and shall be construed to provide a complete, additional and alternative method for the doing of the things authorized and shall be regarded as supplemental and additional to any other laws. Insofar as the provisions of this act are inconsistent with the provisions of any other law, general, specific or local, the provisions of this act shall be controlling.