Happy for suggestions :)
at the moment I like how there are some reasons to have the bio chamber ecosystem set up on Aquilo and Fulgora, but Vulcanus is not really caring much for it. Because it is so abundant on resource, Biochambers don't really help with any issues the planet has. I'll think about it i guess

Making solid fuel in biochambers seems like an easy choice, and maybe simple coal liquefaction as well as basic oil processing.

I did think of some of these ideas also. For me, i want rocket fuel stuff to be Glebas thing. (LDS is vulcanus’ thing, Blue chips is fulgora). So i kind of stayed away from solid fuel being that its the step underneath rocket fuel. Might think about it again.
As for coal liquefaction, just seems super industrial for a biochamber vibe. I also worry the poor refineries don’t get many recipes. Im always thinking about these things.