If this was Vikings in space, then yes, you could build as "high" as you want. But structural restrictions are unfortunately part of the real world. Gravity, physics and all that. It's actually already pretty unrealistic how high these vikings can build but whatever.

Anyway, as you get better material, you can build higher. And bring the ground to you by terraform your supporting structures so they're touching the "ground" (even if it's way up in the air). And use those iron pillars before your supporting structures. You can build very high, unrealistically high...