Except as otherwise provided in this chapter, the board of a school district may issue and sell evidences of indebtedness under chapter 21-02 or 21-03 to finance the construction or improvement of a project approved under this chapter. The principal amount of the loan and the evidences of indebtedness to repay the loan may not exceed the loan amount for which the district is eligible under this chapter. Evidences of indebtedness issued under this chapter or chapter 21-03 constitute a general obligation of the school district.