I had a request from 64north
for more details about the folding bench.
Here are more pictures of it.
As can be seen here, the back folds down.
The bench can open about 75° high without the cushions, but when the 4" thick cushions are in place they get squished at the back and it becomes difficult. I set the lid supports to keep it open at around 50°.
Here's the back angle.. Can't remember what I settled on, but it's comfortable.
The piano hinge is too thin of a gauge material to hold up to bodies moving around on top of it when it's opened as a bed, so I added these supports. Now the weight rest entirely on the wood instead of the hinge.
With the cushion in place you can barely see the additional supports.
North64 also asked about the backrest "leg". It is proving to be plenty strong. With the weight of the plywood resting on it alone it doesn't want to slip out. Once the weight of a human is on it you can't even kick it out.
This may seem like a strange design to some people, but it was the only way I could dream up that would allow a 50" wide bed when open, but only a 20" wide seat when closed.
I'll be adding gas struts to it eventually to make it pop up on it's own once it goes beyond 2" open.