Badarpur investment: hidden costs and payment plan dilemma?

Construction-linked payment plans in Delhi are a headache for NRIs like me. I'm in Dubai, eyeing a 2BHK in Badarpur with The Kings Properties, around ₹90L. Site visits mushkil hain. What's the real all-in cost beyond property price? Stamp duty, registration, PLC... kitna extra lag jaata hai? Aur possession pe hidden charges ka kya scene hai? Should I push for a down payment plan for better value?