(a) Each design-builder shall be licensed to do business in this state and be a licensed architect or engineer or a general contractor.
(b) Each design-builder may:
(1) Assign or sublet the responsibility for professional design services to an architect or engineer licensed in this state. The architect or engineer shall carry, at all times, professional design liability insurance in an appropriate amount as designated by the agency. The architect or engineer may be a full or part-time employee of the design-builder; and