You can expect: full process (25h of real work) from the idea to renders in roughly 4x speed in 6 videos of 20-30 minutes, explanations of the most important parts.
THE PROCESS COVERS: Sketching; reference gathering and organization; first 3d steps; 2d/3d iterations; subd to cad; staying dynamic throughout the process; quick rendering.
The process DOESN'T include the rigging and the animation.
Homepage:

https://www.artstation.com/marketplace/p/JgGNW/2d-3d-weapon-design-process