The revenue bonds may be issued to provide all or any part of the funds required for the acquisition, construction and financing of said project, including any or all expenses incidental thereto or connected therewith, and such expenses may include engineering, inspection, legal and fiscal agents’ fees, costs of the issuance and sale of said bonds, working capital, reserve fund, and bond interest estimated to accrue during the construction period and for a period of not to exceed 12 months after completion of construction. The proceeds of the bonds shall be used only for the project provided for in the indenture pursuant to which such revenue bonds are issued.