I am utterly charmed by Lignumis and am close to finishing out a full run with it enabled. I've got all the planetary sciences going and am going back to build up Nauvis a little with all the new toys before looking at Prometheum science and ending the run.

Here is something I noticed: the new plastic recipe has an interaction with lubricant. Normally you produce so much plastic for chips that you can produce lubricant as a minor byproduct and never have a problem. For my Lignumus run, I went all out on the organic plastic recipe, so I'm using very little light oil and petroleum. I just use it for launching rockets and for lumber mill fuel :) . As such, it's hard to make lubricant due to light oil hitting a cap and the refineries shutting down.

The workaround I am doing is to have a sub-factory that goes advanced oil processing -> heavy oil -> lubricant, and then I void the light oil and petroleum by converting them to solid fuel. This is very wasteful, though.

It would be neat to also have an alternate lubricant source that corresponds to the alternate plastic source. As it stands, I am not sure if it is even the best choice to use the alternate plastic recipe on Nauvis. I did it because I wanted to try all the Lignumus goodies, but it may be better from a min-max point of view to stick to the oil-based recipe on Nauvis.

The alternate source of lubricant could be another kind of bacteria, or it could even just be something that down-converts light oil back to heavy oil.

Looking on the forums, I think the simple oil cracking recipe used to produce heavy oil. In the game as I have it, simple oil cracking just produces petroleum, so that's no good for this problem. There's also coal->heavy conversion, from a Vulkanus recipe, but I am not sure about using coal to get petroleum if it is just for this problem. That's definitely an option, too, it just means finding coal mines to pull from.