In accordance with the requirements of the federal Rehabilitation Act of 1973 (29 U.S.C. § 701 et seq.), the commission shall establish a designated state unit within the commission that:
(1) is an organizational unit designated to be primarily responsible for and concerned with vocational rehabilitation of individuals with disabilities;
(2) has a full-time director;
(3) has a staff employed on the rehabilitation work of the organizational unit, all or substantially all of whom are employed full-time on such work; and
(4) is located at an organizational level and has an organizational status within the commission comparable to that of other major organizational units of the commission.