Hi Andy
Not sure where you would get a screen, maybe a search for racing fairings may throw something up. Hope I dont break mine!
Bags and rack are Rickman sold as Honda Britain in the 70's. Panniers bolt to to the rack, but I've modified the set up with big knurled fasteners to enable quick release, not that I take them off that often but helps with maintainance. Box's are fibreglass showing lots of patina.
Good luck with your search.
Bob