Well, here are the fruits of my labor for the past week and then some. These are the 'final' images for my Thunderome entry. It's still May 1, so I'm still very much open to suggestion.
Week 1 was spent drawing pages of rough sketches and design concepts. About 3 hours total. Select sketches from this phase are compiled in the 3rd image.
Week 2 was spent refining the concepts and producing the final images. The drawing for the tank took about 8 hours, from pencils to inks. The rendering on the tank took about 16 hours, spread over 3 days. The character rendering took about 5 hours from pencils to Photoshop. These comprise the 1st image.
I did the orthographic drawings tonight--about 4 hours to draw and composite. Most of that time was spent just fiddling around with the size of the images and the 'animation'. The orthographics comprise the 2nd image.