Otherwise, if you don't want to drop the idea, then buy an existing property. How the hell do you come up with the idea of wanting to have a house built by the developer in 11 months when you can buy an existing one without stress? That’s the topic of "wrong idea in your head due to time pressure"!!!
No matter whether existing or developer, your equity is not even enough for the ancillary purchase costs, so you will get poor conditions for financing.
Forget it!