Costing analysis- FRP door vs Flush Door - guidance needed

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All

I am in process of deciding between Flush Door vs FRP door. Since I am an owner who will be staying in my own house, I have decided that I will go in for "middle level " brands. E.g. I will not go in for very cheap doors - which typically smaller builders will use and will not go for high value brand like Godrej Entranza either.

In this case, an interesting analysis comes up.. I want to confirm the same.

Cost of an "OK level" flush door ~ Rs 65-70+ sq ft (omega doors, niki doors etc.)
Cost of painting the flush door ~ Rs 30per sq ft
Cost of making frame ~ 2000 (Salwood+painting+labour)

Total cost for a 7*3 door ~ 4500

Cost of FRP door (450GSM FRP) @Rs 160 / sqft = 3360
Readymade Frame = 1500 Total ~ Rs 4900

So the final difference comes to only Rs 400 - hence am planning to go for FRP (has longer life)

Are the above costs correct or am I making a mistake ?

[amarbs]

Are FRP frames better than hard wood frame (Sal or Honne)? As per my understanding FRP frames do not warp or crack like hard wood.

Can flush doors or other membrane doors be fitted to an FRP frame?

Thanks in advance for your guidance.