In the warm water, dissolve the yeast and a pinch of sugar. Set aside until activated and foamy, about 5-10 minutes.
To a large mixing bowl, add the 3 eggs. Whisk lightly.
To the eggs, add the sugar and salt. Whisk together until blended. While continuing to whisk, pour in the melted coconut oil. Add the activated yeast and water mixture and whisk together to combine.
Add 3 cups of flour and stir to blend well. The batter does not have to be completely smooth. Small lumps are okay.
Add an additional 3 cups of flour and stir to incorporate all of the flour.
Continue to add a little flour, maybe 1/4 - 1/2 cup, at a time to the mixture, stirring after each addition. Only add flour just until the dough starts to leave the side of the bowl and starts to lose its shiny "wet" appearance. The dough will become heavier and more difficult to stir. The dough will be somewhat slack, rough looking and sticky, but not gooey as it was with only 6 cups of flour. It may be difficult to stir and you may have to use your hands to incorporate the flour at the very end. Sometimes I can manage with a strong spoon and sometimes I cannot. (Please see Notes section about adding flour.)
Cover bowl with plastic wrap and set aside in a warm place to rise until double in bulk, about 1 hour, depending on the warmth of your kitchen. Alternately, the covered bowl can be placed in an oven with only the oven light turned on. (NO HEAT!). The light bulb warms the air in the oven.
Punch dough down and let it rest in the bowl for 5-10 minutes. Divide dough in half. Leave one half in the bowl and cover with plastic wrap. Place the half on a lightly floured countertop. Gather the dough into a ball. Again, the dough will be slack, but will loosely hold the ball shape.
Line the bottom a 9- x 13-inch baking dish or pan with parchment paper. (See Notes.) Butter the sides of the dish or pan well. Set aside. Note: If you do not have parchment paper, be sure to butter the bottom of the dish or pan well. As the cinnamon rolls bake, the filling tends to melt under the rolls and can cause sticking.
Lightly sprinkle the top of the dough with flour. With a rolling pin, roll the dough out into a 16- x 12-inch rectangle. If the dough is resistant to being rolled out and shrinks back together, allow it to rest for 5-10 minutes and then proceed with rolling. Sprinkle a little flour on the top of the dough if it sticks to the rolling pin.
For this step, the butter needs to be very soft. Spread the butter evenly over the dough, keeping an approximately 1-inch border of dough around the edges clear.
In a small bowl, whisk together the brown sugar and cinnamon. Sprinkle over the buttered dough, again avoiding the edges of the dough.
Starting on one long edge, roll up the dough into a log shape. With a serrated knife or a 24- to 36-inch length of unflavored dental floss or string, cut the dough into twelve rolls.
Place rolls, swirl side up, in the prepared baking dish, 3 across and 4 down. You may have to snuggle them together, but they will all fit. Repeat process with the remaining dough or reserve for another use. This dough can be refrigerated for up to five days. Cover the dish with plastic wrap and place in a warm place to rise, about 45 minutes to one hour.
Near the end of the rising time, preheat oven to 350-degrees F. Bake rolls until a light to medium golden brown, about 18-20 minutes. Remove from oven and place dish on a cooling rack.