All of the above are excellent questions that you need to have answered to your satisfaction before investing. I would pay very careful attention to the developer. What's the developer's track record with completed projects? What are their financial resources? How long have they been in business? Are they managing any other projects? If so, try to check them out and see their condition.
Pay close attention to those first five questions regarding the renters. If the project is focused on foreign renters, what's the plan to deal with another covid or large-scale civil unrest that keeps foreign renters away for long periods? Here in Pattaya, there was a developer offering a good financial return on rental units, with a number of completed projects, who went belly-up when covid hit and the foreign renters the developer counted on were cut off. If the plan is focused on a steady stream of 'X' renters to remain solvent, what happens if that stream of 'X' renters goes dry?
Investing in property has been financially-rewarding for my Thai partner and myself but we've relied on doing everything ourselves, not on another party or on an investment such as this. I would say do your homework, get thorough answers to all those questions, and then make your decision based on those answers.