Miter Bend Layout: https://play.google.com/store/apps/details?id=com.pinjara_imran5290.Miter_Bend
Specific Gravity: https://play.google.com/store/apps/details?id=com.pinjara_imran5290.Specific_Gravity
Link for e-book for fabrication Layout development. https://www.amazon.in/Fabrication-Layout-Development-Numerical-Methoebookd-/dp/B01MPW1XY6/ref=sr_1_1?ie=UTF8&qid=1518879272&sr=8-1&keywords=fabrication+layout+development.