Tudor morris 03 ballista orthographic views
Orthographic Views
Tudor morris 04 ballista exploded schematics
Exploded view to make 3D modelling easier
Tudor morris 02 ballista firing arc and rotation
Movement breakdown
Tudor morris 01 ballista initial variations
Initial Design Variations, a lot of these after natural forms (beetle mandibles, insect legs, hammerhead shark etc)

Doing Concept art demos at Childwickbury Arts Fair over the past weekend, and talking to people about the whole process & what concept artists actually do. I went through the process of creating a Ballista