Make a frame, cause modifier frame fails Is there a way to make the following possible:

I want to cancel the part where i put the blue cross and have a frame starting from where i outlined it with red till the edge. It needs to be a mirror frame.

I have tried the wireframe modifier, but that created a very different shape than i desire as you can see on the other picture. Is there a way for this?
draw the shape you want out in  Photoshop or paint then go into blender and try to box model the shape, the wire frame modifier will just turn your edges into shapes.