maybe you can buy two 5x5x5s and glue parts of the axis and corners together. that's what i did to my 3x3x3, and my friend did it to his 4x4, maybe it might work on a 5x5x5.
Welcome to the forum!!!!!! How loose are the 3x3x3 and the 4x4x4 cubes? How long ago did you do both of those and is the glue still holding? Just curious thats all!!! I'm a little sceptical.
Sorry about that. I'd love the idea if it works. How do you make the pieces close to each other but on the other cube? Thats what hard for me to understand. Won't the glue get old, brittle and break? Thats what scares me because all the time, money and energy wasted in the project.