Scratch building with Inkscape 1: The absolute basics
Scratch building with Inkscape 2: Making the most of Inkscape

Industrial Scratch Build 1 - The Paper Mock Up - Scratch Building With Inkscape
Industrial Scratch Build 2 - The Card Test Fit - Scratch Building With Inkscape
Industrial Scratch Build 3 - The Inner Skeleton - Scratch Building With Inkscape

Scratch Building with Inkscape: Textures - your questions answered
textures.com
Scale Scenes Railscenes