Oh yeah. I'm thinking flames! ;)
The box made the build very, very easy. It's thick enough that I was able to cut holes for the switch, led and rear wheel (using a caster wheel I found in the garage) and install them by snapping them in place, as they are meant to be (I'll take better pics tomorrow). For the rest (batteries, board, speaker) I started by mounting things inside cleanly with double sided tape... Then after changing things enough times I figured 'heck... it's a box!' and now everything just sits in there without being mounted in any way. I'm and endless tinkerer. That's why I'm in love with header pins and jumper wires, and why I like the box.
Yes, it's a functioning robot. Avoids obstacles, plays a lot of different noises (mostly 8-bit inspired), backs up and beeps and has some random behaviors like looking around, stops, narrow turns, etc...
I attacked the code at the top.