These are pillars to which you attach wall panels and floors, connected by lintels. You can build the pillars up to the height you need. They have grooves to insert the walls, and the walls have holes for installation with floor-ceiling pins. Their can look very different, I didn’t find the version we want yet, but we don’t lose hope.
![Constructor Elements By Tehnolog Company Constructor Elements By Tehnolog Company](https://buildkitpedia.com/wp-content/uploads/2023/09/krepostsa.jpg)