How make an UI / game layout something like this?

Hmmm… I tried setting up a Scene Capture Component 2D instead of a normal camera. Then I set the UI so that the rendertarget is the size and position I want it to be.
The positioning works wonderfully, but other problems occur;

1)RenderTarget neglects the post processing I have.
2)There is still the normal rendering occuring underneath my UI, meaning huge FPS loss due 2 renderings. Its more of an picture on a picture instead of a repositioned picture.
3)Rendertarget display ignores my vertical movement for some reason! My character cant look up and down, only turn left and right and move as usual.