I am afraid the cardboard will fall apart easily. Is the cardboard of good quality?

The cardboard included with the kits was selected to provide the best experience for people of all ages.

Because it's cardboard, repairs can usually be made with common household materials like tape and glue.

We also recommend holding onto the cardboard sheets, even after the pieces have been removed from them. Later, the removed pieces can be used as stencils to trace and cut out spare parts from the empty bits of these old sheets