Dear Sarmad
1.Tile/marble work shall be completed b4 installtion of chogath.
2.chogath to be fitted only on top of tile/ marble with help of 6 inch long bolts. Use only plastic gatttiii for chogath fitting. Never use wood gatti for fitting of any thing. Wood gatti will reduce its vol with passage of time eventually resulting in looseness of door and chogath both.
3.Wall side with which chogath will touch shall be plaster properly dont save money via non plastering this side.
4.Cover the chogath and wall side fully with BITU FLEX( an rubber type latex material) after mixing BITUFLEX with turpentine oil and any good brand termite poison.This will completely close the wall pores and protect the wood from termite. Whenever termite will touch with wood , termite will consider BITUFLEX coating as wall/ solid thing and will divert its way as termite dont have eyes, it runs on wood taste and smell.
5.Covers of chogath from inside ( side of wood cover which will touch with chogath) to be covered as well before final covering of chogath.
Chances of termite are 99.99% eliminated when above measures taken.
If finances are problems then before final fitting of chogath just spray termite chemical after mixing with turpentine oil on wood chogath and wall side.
Pic of Chogath fitting with Bolts.You can see chogath fitting done after plaster.