Hi. I'm not so great on these technicalities :-). I think the one in the picture uses wood, and placed vertically like that I think the slats would have much more strength than if they were flat. But I don't think even really hard woods would stand up to coconut pounding for long. Perhaps if you could find someone in your area that makes security gates like the one below, you would be able to source the slats they use through them (again, no doubt these slats are made from a variety of materials, you would have to find a tough kind).

give some detail pls

Glo panels , Euro patric..top highlighter brands material

There is nothing special about Kerala climatic conditions that require anything special (yes, I have several years experience with kitchen cabinets there). You can use BS 710 or 303 plywood with laminate on them with excellent results. Several interior firms also use HDF/MDF with laminate without much complaints from their clients.