"Basically no overhead what so ever"
You better reevaluate that statement my friend, and then recalculate your numbers. sorry but I'm just trying to help, you just don't understand your costs, so you can't possibly bid this or any other job correctly. For now you better pass, because a lot of work goes into planting a tree that size, and I'm telling you 6-700 isn't the cost.
"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