Help Please...Messy Corner Junction

[Kristine]

Hi all. Can anyone offer some assistance in helping me rectify this mess of a corner I've created.

As you can see, nothing lines up quite right and there is roof showing through the wall. I've tried a few things though each change I make seems to impact something else, then I end up with more problems I don't know how to best resolve.

Any advice greatly appreciated.

 

Rebecca.plan