Sadik, one question, so you used teak for the 4 pillars and plywood for the trays right?
If I drill additional 3-4 holes on the pillars near every current position of rack so that moderate height adjustment of trays are possible in future would it make the pillars weak?
Also what about dust covers? I mean I saw another FM also asked, for me where I stay on one side there is a playground and opposite side a railway station, both source of uninterrupted dust supply. Individual covers are fine but I am looking for some additional ideas.