While the B3 never made it to production due to Marussia's closure, a prototype was partially built, but ultimately left unfinished. The prototype, design sketches, and some renders can be seen on the designer's website here at the bottom of the page.

EDIT: Decided to archive the images in case the page ever goes down:

• Concept illustration
• Render 1
• Render 2
• Render (forest setting)
• Render (red + plains setting)
• Unfinished prototype
• Headlight closeup