ok what you need to do is make sure you have selected UV's so right click over your UV's and choose UV in the marking menu and then drag a slection to select all of them, now hit the R key on the keyboard to change to the scale tool, you should now be able to scale them using the center box so it's proportional.Once you have them scaled hit Q on the keyboard to change to the select tool and select a UV on one of the shells then under the select menu in the Texture editor click on select shell then hit W on the Keyboard to change to the move tool and move the shell into position in the top right hand area .Hit Q to go to the select tool and repeat for the other pieces until you have them all in the top right erea, you can rotate them to make it fit better if you want but the aim is to fill as much of the square as possible so don't scale them too small.