Hi Alpo,
Thanks for the answer. It is not at all late. It is a winter project, moving very slowly. The main use of the inflatable mattress, won’t be as a mattress 😉. It will join two inflatable pontoons of a small inflatable catamaran, I intend to make. Just cut the tpu nylon for the pontoons. I want to make something similar and use it similarly, as the inflatable seat of the anfibio omega c2 , from I got the idea. As you can see at the photos , there is not any baffles bulging. Is it, because the sides didn’t cut straight, as in my photo? To avoid any baffle bulging should I cut the sides as the , down dotted side at my new drawing, you can see below? To avoid ballooning as much as possible and be closer at the desired width of 40-45cm, I also increased baffles number and reduced width, as you can see.
Thanks, once more for your thoughts