As I like to do whenever I post about Spacechem, here's a little concept work from 2010 when we were first working on the game. This mining boss is one of the first you'll "fight" against in Spacechem. I drew upon industrial machinery when concepting for this, as well as mining vehicles in RTS games like Command and Conquer. I'd also forgottent hat I'd actually used Google Sketchup to help me better visualize the machine before drawing it in Photoshop. While the Sketchup concept and the final product aren't 1:1, it's amazing how useful Sketchup as a free software can be for conceptualizing objects like vehicles and buildings.
By the way, even though Spacechem was nominated in this year's Indiedb awards, it still needs more nominations to find out where it ranks in the top 100 indie games of this year. The whole Spacechem team would rally appreciate it if you could click here, then click on Puzzle Compilation, then click on Vote! While you're at it go on and check out the other fantastic indie games on the list.