I'm not familiar with the project that inspired this one, but you should pay attention to hot spots, heat should be equally spread across the whole plate.
plus you should have good sensors and provide controllable configuration of heat points for soldering different components according to the manufacturer's datasheet.

@NeverDie
Based on my simulation and testing it's not a problem, yet I can look at it and check it's transient response.

@NeverDie I tried to add it, but it seems "kicad_sch" extension isn't supported now

@NeverDie of course, I'll add it now