I figured out a design! After calls to friends and chatting with friendly people at the local hardware store, I go with this design where I route out a single 2x4:

I go with this design to prevent complicated carpentry work that I'm not confident about. Instead... I still do carpentry work I'm not confident about, but at least it's simple! Also, I get to buy a new toy :P

I really want to replace this terrible light fixture under my cabinet:

It shines light right into your eyeballs and give you a headache. Not ideal.

To replace this, I want to build one! But a little fancier. I want to have:

• The light to not shine directly into my eyeballs
• Granular power controls
  • Turn a section on or off
  • Turn all on
  • Turn all off
• Color controls
  • Modify the color to be any RGB - ideally warm white or cool white (I like a brighter cool white while my GF likes a warm white)
• A nice wooden housing