Here's my trailer.
It has a window in the door too... (I assumed they all did...). Are there pics posted of your rear upper bunk? That sounds interesting.
Yesterday I got new foam cut for free from a family friend that has a business making restaurant booths etc... can't beat free. I downsized the foam to 3" except on the front bumk top where I went to 2". My thinking is that in a small trailer every inch counts. For the front top bunk, given the way it folds down into a seat back, the thinner foam should give me more bottom front-to-back space when it's down (by 2") When it's up it'll only ever be a child or small/light adult sleeping up there so the thinner foam hopefully won't be a problem.
I sat on the 3" foam and it's ok. Laying on the 3" foam is fine too. I hope my thinking on this works out to be ok...
We bought some cool retro-ish fabric at IKEA last weekend - my wife is going to sew up new covers.
Pics when it's done...