"Construction" section on front page

I think it'd be valuable to add a section on fasteners (ex. what you'd find in Carroll Smith's book, Kent's MEng Handbook, or aircraft handbooks), materials (alu, steel, titanium, mag, plastics, and composites), and something on tools and welding. A start being:

Construction

Fasteners

 >Nuts
 >Bolts
 >Rivets
 >Safetying
 > ...

Materials

 >Aluminum Alloys
 >Ferrous Alloys
 >Magnesium Alloys
 >Titanium Alloys
 >Plastics
 >Composites
 > ...

Tools

 >Hand Tools
 >Metal-Cutting Tools
 >Drilling, Taps, and Dies
 >Sheet Metal Tools
 >Forming
   >Press-Brake Forming
   >Stretch Forming
   > ...
 > ...

Plumbing

 >Solid Lines
 >Flexible Lines
 >Connections
 > ...

Sorry for the rough formatting, this was just an idea dump

I think this is a good idea. It was suggested previously that this type of section be added. Perhaps it can be called "Engineering Materials" or something?

We also need a place for a master list of reference books so that could go there too. What are your thoughts?