I have made my first prototype, and decided that making 1 sword was enough, since making all 4 of them would take a lot of time. My first prototype was a bit messy, and I have since added holes to perfectly align the pieces together.
Also, from the prototype, I learned that even with 3mm cardboard, the handles were a bit thick, leading me to make changes in my vector drawings. The following vector drawings are that of the sword I would like to make.
Afterwards, I realized that I did not have enough time to make the blade out of layered foam, so I decided to make the whole thing out of 5mm thick plywood. The result is in the picture that follows.