You can also use the Blacksmith perk if you plan on doing melee damage in your power armor. Science (Int 6) - Allows you to craft high-tech mods.Armorer (Str 3) - Allows you to craft mods for armor.If you want to make the best armor you can, you'll need the right perks. Both are found throughout the world, or crafted at your settlement if you have rank 2 Local Leader perk.
You need an armor workbench to mod regular armor and a Power Armor station to mod power armor. This guide will go over everything about crafting armor and power armor mods including: Check out my Fallout 4 Weapon Mod Crafting guide if you want info on weapons. I'll go over the types of mods you can use in armor and what you need to make them.