Creating complex shape

High Alt Wellington.shapr (6.6 MB)
I am back with this same problem. I have totally redrawn the entire section that I am trying to model, and have improved areas that were not quite correct.
I hope that my model will load, as I am not sure if I have done the link correctly. The part I now need to get right is the front bottom end. Firstly I need the bright green area to blend with the red area, and then I need to create the curved shape in front of that. I have tried so many extrude. Lotta and revolve options, subtracting bodies etc. But I cannot find a way to achieve what I need. Please help me to create this or point me in the direction of a tutorial that may help.