before i even joined a firm for job, I happened to work on my friends new residence project.Im asked to design plans and also create 3d model. How much should i charge w.r.t industry standards.Im in thrissur ,kerala (Suburban area, meaning average kerala town). Also how many revisions of changes could be made within each payment. I ChatGPTed with some basic info and it suggests ₹50/sq.ft. Asking to for a better understanding of pricing