On his page, Ben mentions,
“This was a custom job I did by request, the second of the year (First being the Neo Geo Portable) I don’t usually go for suggestions, but if they’re reasonable (unlike, say, an XBox 360 that runs off a potato) I sometimes consider them. And if your car’s timing belt takes a dump on the way to McDonalds (unlike humans, who usually take a dump AFTER McDonald’s) extra “side job” cash is always appreciated. Well, that and I figured I should do something with a different classic game system for a change, instead of my zillionth version of an Atari portable.”
I’m not terribly familiar with the Colecovision myself (it’s a bit ahead of my time), but Ben never ceases to amaze me.