The keypad was designed in EAGLE, so ruiqimao's guide only partly applies here. Not to mention almost every part here is through-hole, since I lack tools to perform any type of SMD work.
I also need to review how to adapt TMK onto my keypad. The keypad is running on an Arduino sketch right now, which verifies the circuit's functionality but lacks quite a bit of features.
EDIT: I added the guides I used up top so feel free to review them.