I'm getting these idea from the project-E mod in minecraft, where every item has an certain value and you can add those vallues up by combining items with lower values into items with higher values.
Basically my idea is that you implement a building that takes account of all of the organic resources and gives each one an organic material value. So for instance, since wood is solid organic matter, it could have an OM value of, say... 100. Then since wool is pretty light and doesn't contain much mass at all, I'd give it a score of 5. I would give food a score of 10, oil a score of 25, plastic a score of 20, sugar a score of 1, and water wouldn't have a score, you would just need it to make things. but basically, the structure that I have in mind can turn 20 wools, 10 meals, 100 sugar, etc. into 1 wood, but can also turn 1 wood into 20 wools, 10 foods, 100 sugar, etc. it can also turn 2 wools into 1 food, or one plastic into 20 sugars.
It would have it's own menu and let the player store items in the structure in the form of organic matter, but would also let them specify what resource they want it to produce from the it's pool of organic matter. Any organic items that you put in will be converted to organic matter, and then when there's enough of it to produce the desired resource, the structure consumes the apropriate amount of matter to make the item.
hard to explain, but if you research the energy condenser from project-E or equivalent exchange, you'll see what I'm getting at.