>>10938445You have no idea how much you helped. I didn't stop looking and stuck with 80s catalogue until I found similar "pieces" to what I was searching for. Turns out I was in the wrong category. I wasn't looking for building blocks, but modular toys. In the 80s catalogues there was something called Wheeled Warriors, and I kept letting the google algorithm guide me until I saw the term "modular space toys", added a "1990s" behind it, but only got like 5 results. One of these had the answer for the brand: "Silverlit Mulitmac". I searched for that and at first I thought I was so close yet so far, then I saw pic related and that was it. Those were the "tubes" I was referring to.
Ah, closure. Thanks anon.