Rockwood 8313SS Bunk Modifications - Seeking Help

I have an 8298 and it had a narrow top bunk which I pulled out and framed up a wider one with a wider memory foam mattress. The walls should be plenty strong as all of the cupboards are just screwed in the the walls and most don't hit the studs.

I just made sure to put enough screws in to make is strong. Just make sure you don't over tighten as it is only thin Luan and can strip easily. Snug works well.