Question #1. I agree with the recommendation to use equipment grounding conductors in the raceways, but it is not a code requirement. 250-118 lists both rigid and EMT conduit as equipment grounding conductors.
Question #2. Not covered by the NEC, but repalcement parts should match the original equipment.
Question #3. Also not covered by the NEC. The IEEE "Green Book" has a statement that, "a resistance on the order of 1,000,000 ohms to ground is usually satisfactory for static mitigation". The book also states that, "any ground adequate for power circuits is adequate for protection from static electricity".