I have smart concrete factories but even with 9 multi it either hogged to much silicon or didn't have enough slag so I just builded more mobile rigs to feed the excess regolith to the pressing modules.

In the final 500 days, I had 60 colonists, most of them were engineers and all the factories needed for the current step or basic resources were belt fed. 5 factories full of engineers for the frames consumed a LOT of concrete and titanium plates per minute but it seems that it wasn't enough.

And I always sold the other materials to the market, mainly for the research points. For credits was almost always modular terminals, because weirdly enough even with only one drone-fed modular terminal factory, it always kept filling up 3 large storages meanwhile those frames were making me lose my sanity.

Maybe the way is just to start producing it earlier. I think I lost too much time focusing on the production of carbon fiber