some doubts regarding the project

[serlancelot]

hello! I have seen your ELS project and I have some doubts... and I would like if you can answer them before I start buying the components.

The first is the use of a 4-layer PCB, is this for any specific reason? (signal shielding?) Can only two layers be used?

The second is if you have thought about or are going to put a color LCD screen with graphics, in that case could the same PCB be used or would it be new?

Thank you very much for creating this project!!