Electronic circuit for my Final project

Hello mates,

I have some issues with the electronic circuit for my final project. I have some ideas, but I am not sure if it should be designed in this way.

My final project is the vaporizer for dry herbs. There is a heating chamber made of ceramic. It combines two way of heating: conduction heating and convection heating. You can see it in the picture. There are two coils: the first one heats the walls of the chamber and the second one heats the ait that goes into the chamber.

I plan to use transistors to control the temperature of the coils. Two potentiometers allow controlling both transistors. However, in the final project, I will not use potentiometers. Instead, I will control them with AtMega. The power supply is two 18650 accumulators.

Can you please check if the scheme has any issues? What components should I use?

Moreover, let's get in touch if you are interested in my project. So we can create something even cooler together.

Please, check my webpage for more information

Kind regards, Nick