[asheshouse]

You will probably be quickest starting afresh with this. The hull shape is one of the trickiest bits to get right.
You need to start with some good drawings and must have a drawing of the hull lines.
Set all these up as reference images on planes. You must spend as much time as necessary to get these correctly scaled and aligned to each other before you start modelling. The image below is my "work area"
Set them up so that the bow points towards -ve y axis, the hull should be centred on the origin of the axis with sea level at zero on the z axis. (This is important later when importing the model into the game).



All the images are aligned and to scale. The hull lines details are shown to the right.
Model one side of the hull using planes and use the symmetry modifier to create the other side.
Start with a single plane mid-ships and get the vertices correctly located in 3D space. Once the first one is correct then extrude the edges to create more planes. I think its easier to do it this way than to start with a large solid and try and trim it down.

I make the superstructure elements "off model", using the detail sheets you see in the image, then move them onto the model when they are complete.

Ranger is quite a complicated model. Not an easy one to do as a first project. Good luck with it.