FREE Armor Modeling eBooks . Yes , free !! Nice read...they go through different armor kits...defining materials used , techs etc....
You will need Adobe PDF reader ..get it here.
https://get.adobe.com/reader/


Click on the link to open/download Blitzscale E Book 1 66 pages
https://dl.dropboxusercontent.com/u/98846821/Blitzscales/Blitzscale%202%20September%202016.pdf
Click on the link to open/download Blitzscale E Book 2 68 pages
https://dl.dropboxusercontent.com/u/98846821/Blitzscales/Blitzscale%203%20November%202016.pdf

Been following Federico for years at http://www.fcmodeltips.com/

Lots of interesting tips and ideas to improve your model without breaking the bank.

He also runs his own store: http://www.fcmodeltrend.com/