Making Solid State Switching for Car Headlights

Commonly, car headlights are triggered with relays. I'm fine with that, but, I just dislike the way the contacts wears out over time.
Solid State Relay (SSR) are already in the market, but tend to be quite pricey.

This is my attempt of building one cheaper.

Preparing the PCB.

Searching for perfect configuration.  

Cleaning the heatsinks.

Applying thermal paste, using line-method. Why?

Ready to go.

Upper left is the 555 inverting gate driver, lower right is the power PMOS.

Almost done...

Cleaning flux residue with methanol.

I'll update this post soon.To be continue...