First Pune flat: hidden costs and under-construction worries

Under-construction projects feel like such a gamble sometimes, especially for a first-timer. I'm eyeing a 2BHK with Rama Group in Keshav Nagar. The basic price looks alright, but honestly, I'm clueless about the final budget. How much should I realistically set aside *beyond* the property price for things like stamp duty, registration, and basic interiors? Did anyone have unexpected costs pop up? Also, for under-construction, what's a solid checklist for site visits? What specific questions should I ask about delivery timelines or potential delays? My parents are pushing for resale, but new launches seem more promising. Just trying to understand the full picture before committing. Any advice on managing these unknowns?