You can use any seasoned natural hard wood like teak , sal wood etc. Another alternative is acacia wood (cost effective)!

Dear Kiran, It is a good idea of having a curvilinear false ceiling design for a living room plan like this. It will make your space look spacious as well as it will help create a character wall by accentuating the TV screen. The light colour palette will further make the space look harmonious and bigger. We at Offroad Designs, hope this idea will help you. Best Regards, Team Offroad

Pradeep, plywood or Gypsum has little do with heat reduction . It is the air layer between the actual ceiling and the false ceiling that does bring the temperature down. So as long as you are having a gap of 4-6 inches between the two ceilings it shouldn't matter. Gypsum would be more cost effective. Thanks, Nitin CORNERSTONE DESIGNS, Bangalore

Basically vox is used for outdoor area and gypsum is used for interior so depends where uh want to apply😀