Sadullapur 2BHK: Investor's payment plan confusion

My agent just sent me details for a DANIYA INFRATECH project near Sadullapur. I'm based in Dubai, so can't visit. They're quoting ₹85L for a 2BHK. Noida mein negotiation kitna possible hai on this? Should I push for a construction-linked payment plan or down payment? Hidden charges at possession time are a worry. What's the real total cost of acquisition?