Ghaziabad investment from Dubai: Hidden costs vs. payment plans?

What's the real scene with hidden charges in Ghaziabad projects for NRIs? I'm based in Dubai, looking at a 2BHK around Rani Laxmibai Nagar, maybe a Parakh Infrastructure project. Builders quote one price, but then I hear about PLC, floor-rise, and random 'development charges' popping up later. Yaar, I can't do site inspections myself, so need to know the actual all-in cost before signing anything. Is pre-launch pricing really better, or just a trap for more hidden costs? Also, any insights on construction-linked payment plans vs upfront down payment from an investor's view? Managing from afar is tough. Should I trust a local lawyer for due diligence or rely on builder's papers? What's the best way to tackle this?