What products should be part of the mfg (tech) tree?

Products are inventory items that finished the mfg cycle (materials -> components -> products).

At this time, materials will be:  metal, silicon, carbon

Components: mostly undecided but would be determined by materials and product.  Example solar panel can be made of glass (from silicon) and solar cells (silicon) and frame (metal)

Some possible products:

1. solar panels

2. batteries

3. electric motors

4. cameras

Share what you think would be good products.