I think I'm going to see about making a model for the small refinery types like the Arc Furnace. I want to get a base line and a process in place so I can churn them out regurlaly. After that would be anywhere from 1-4 custom models for them, then Big refineries, then Assemblers, and finally other blocks.

Depending on how ambitious I am and time constraints, I might just stick different doodads on each type to differentiate the look of the base model or at the very least re-texture them. I can save a little time using existing build state models from Keen if I keep the block size uniform. However, I'm thinking the Chemical Assembler and Gas Refinery should have totally custom models with roundy bits on them to represent compressed gas/Liquid storage.

I want to stick with the same block size as Vanilla where possibile while still keeping the general Keen style.

The overall progression plan for production will be:
-Emergency Refinery - slow, inneficent, cheap to make, only refines things needed for basic survival blocks.

-Small refineries -Arc Furnace, Small Solids, Small Precious Metals, etc - slightly more expensive to build, more efficent and a little faster.

-Big Refineries -Larger versions of small refineries. Faster than small, but take up alot of space due to needing several different ones to cover all ores.

-Current Refinery -Fastest , takes up less space, 2 or 3 can output as much material as all of the
Big refineries combined. Expensive to build.

Assemblers will follow the same pattern.

I'm not sure If I want to do a second level of components. Having played through what I've already set up, I think it would be getting too complex for players to play and myself to maintain.