Thank you for the thorough feedback. And keep it coming! I even and very much appreciate criticism when it's appropriate as it will allow me to grow my skills.
I have tried improving the walls using the "double up" method I spoke about earlier. This is the result.
Even my better half, who usually is not very impressed by my paper crafting, likes this version very much
Regarding 3D printing, the problem is not that I am not interested, but it took me a while to get to this point with my paper model creation skills that I am really enjoying the process now and also I don't really know where to start with 3D. I am pretty sure I will go there in the future. There are a lot of things (like small bottles, cups etc.) I could do that I cannot with pure paper! I am kind of waiting for it to come into my life in an organic way.
Cheers