There is hereby created in the State Treasury a special fund to be known as the Mississippi National Guard Special Construction Project Design Fund for the purpose of receiving monies appropriated for the purpose of defraying the expense of construction design to enable the Mississippi Military Department to access federal construction funds. Unexpended amounts remaining in such special fund at the end of a fiscal year shall not lapse into the State General Fund, and any interest earned on amounts in such special fund shall be deposited to the credit of the special fund.