Experienced two days no problem, you no experience 5 days. Charge for three days labor, that's fair, I mean cost materials is your problem, you can figure that out easy. I don't like the fact of garden wall being stacked so high, the caps on that garden wall look terrible your caps probably won't fit once you cut in your curve. Other than that have at it.
"Today, we need a nation of Minutemen, citizens who are not only prepared to take arms, but citizens who regard the preservation of freedom as the basic purpose of their daily life and who are willing to consciously work and sacrifice for that freedom." President John F. Kennedy