Thats way to expensive, i pay about 9$ per nicot bottom and they last 20 years and going + no work. If i want to clean Thema, just pressure wash them, more saved time.
This may sound a little silly now, and is just to illustrate a point. I did the same ad you when i started, but had to learn that it often is the wrong way. If i build bottoms myself, I'm stuck to wood and often pay at least double to tripple, compared to ready made good quality products.
I even did build frames myself once, that was the wirst idea i ever had. Takes quite long, and saves maybe 10-20 cents per frame.
Build what you can't buy or is just riduliculus overpriced, but else buy it and have a beer in the time you save.