I found the same bottlenecks, and I’m sure the Dev will adjust the balance of these in future updates. I stopped at the point where I was to supply 500 Iron Frames to the space elevator, as this was taking too long. I did get coal power up and going, and this helped with the power issue I was starting to have (I think I was up to 8 Biomass generators). Having to hand feed those generators was a pain. Coal, once up and going, is very self-sufficient.