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@Harry_PK I'm a rookie here, living in Huatulco, Mexico now after 13 years in Thai. Before that, had a pool service in So Cal for 15 yrs. Have seen construction in Thai and Mexico, both really have no building codes, basically just brick it up and cement over or tile.
The one thing I would say is get a good water sample of your source water(tested for hardness for sure) and use the best/most modern equipment now available. I always emphasize using the least amount of elbows/90 degree joints.
Other than that, if I can help in any way-shoot!