I think your numbers are all low, except for the 3-way switch - $25?
As for time/effort/cost etc,, I think it is a losing proposition. This is a labor of love. Recoupment is possible, profit is fortuitous for the unknown and non- mechanized builder (a cnc machine does help)
I learned to work with guitars by buying $100-300 guitars and seeing how close I could get them to sound and play to my Tom Anderson and PRS guitars. IMHO, I got darn close, and certainly more than enough for the player who is more interested in playability than name and how thick the figured top is. It caused me to ask myself who would ever want to build a guitar, a question I still ask myself, often in the middle of a frustrating build. The answer I came up with is someone who enjoys it, which I do, right now.
Since then, I stopped thinking about the cost. The build provides satisfaction that cannot be purchased. Even if I sold a guitar for cost, I would be happy knowing that guitars I made were making music and making players happy. I like seeing them on my wall and knowing that I created it, similar to the feeling of many jobs I can look over afterwards and appreciate as a job well done. Unfortunately, I don't enjoy playing them as much as I should (too critical of my own work)
You are an artist brother. Create for art's sake.
Sorry for the long non-answer!!