The first thing that I started to work on was the fretboard, which I bought from an online guitar store that already had the fretwire slots in them. It came as a large rectangular piece, so I cut it down to size to match the saddle and nut of the guitar. Then, I cut the fretwire to approximately the right size and hammered and glued it into the fretboard. 

Finally, the most time-consuming step of this process was sanding and filing down the fretwire, which I did by hand with varying grits of sandpaper (starting with 80 and working up to 400) and a hand file. It's really important to file down the frets so that the player doesn't cut their fingers when playing- you can see the difference that filing and sanding makes in the close-up photos (upper photo is unfiled, bottom photo is filed and sanded).