We have an introduction section where you can say a few words about yourself. If you fill out your profile in your "User Control Panel", you can list any hobbies, experience or other facts. You can also list your general geographical location which would be a help in answering some questions.
I would like to see a sketch or rough drawing on the layout described before I suggest anything. It sounds like the top board is higher on one long edge (45°), but what is the orientation of the end of the wall. I would want some more details on this...
I am working on a project were I have a 5 foot wall that would be at a 90 degree angle except it protrudes into a walkway so I had to make the corner, of the wall, a 45 degree wall.