Started a new project inspired by here, here (polish) and here. Currently assessing using IRF830 for the N-Channel MOSFET component of the design. The reference on non-inverting input will be replaced by a PWM-driven input.
Update February 26th: Update Fusion Electronics
While Eagle CAD evolved in very serious ECAD contender and was taken over and integrated by Autodesk in their Fusion360 platform, named Fusion Electronics, I revamped this project and created a 3D version also: