I think I can sit up and have space. I don't have great posture anyway. Was kinda thinking of getting one of those chair back things to lean on. Like the ones you use for beds and looks like the back of a recliner.
Hi, I have the last link you shared. It does open on the side but is flexible so should be no problem in and out. It has plenty of room for the bedrest/backrest you intend to use. I hang things in mine as it is difficult for them to climb the slick part. They perch on my head and jump to the screen though.
Marshmallow and Snowball Freddie and Barnabus Caramel neutered males