Neither this chapter nor anything contained in this chapter is or shall be construed as a restriction or limitation upon any powers, which the corporation might otherwise have under any laws of this state, and this chapter is cumulative to any powers. This chapter does and shall be construed to provide a complete, additional, and alternative method of doing things authorized by this chapter and shall be regarded as supplemental and additional to powers conferred by other laws. However, the issuance of bonds, notes, and other obligations of the corporations under the provisions of this chapter need not comply with the requirements of any other state law applicable to the issuance of bonds, notes, and other obligations and contracts for the acquisition of land and improvements on the land and for the construction of buildings and other improvements undertaken pursuant to this act need not comply with the provisions of any other state law applicable to contracts for the construction and acquisition of city or state owned property. No proceedings, notice, or approval shall be required for the issuance of any bonds, notes and other obligations or any instrument as security therefor, except as is provided in this chapter.