It's complete, we would have said in the Known Issues if not.
I'd recommend you play GC3 with NEI installed, that will help with all the new machines.
The Methane Synthesizer takes Fragmented Carbon in the slot below the carbon tank. The slot above takes an Atmospheric Valve but the valve won't do anything in that slot unless you are on Mars which has a carbon-rich atmosphere. There should also be in-game tooltips which tell you what each slot is used for.