Well I just stepped out in the driveway and dropped a line straight down off the very tip of the bow. The center of the bow eye is 18" back from the tip of the bow.
Cant help you on measuring overall but 20'6" has been widely published so if you go with that the overall length is 20'6" and the distance from transom to bow eye is 19'.
Lastly I have a cuddy and not a center console but I was always understood them to be same hulls.
Overall length is 20'6". Don't know the length from transom to bow eye but it would be shorter than 20'6". Overall length is measured from transom to farthest point forward on the bow. Muy guess is the length from transom to bow eye is closer to 19'6".