*** Variable width conversions were added in version 0.6.0, Original post follows: ***

Good news: The idea I had to do variable width ASCII art works.
Bad news: It’s ridiculously slow and totally unworkable. Currently takes around 5 minutes to do a small image.

Edit – Down to about 10 seconds to do the conversion. Still not fast enough but it’s getting there.
Edit2 – Now 0.25 seconds, and I can still optimise the design a lot more.

Just to show I’m not making this up:

It’s in Microsoft Sans Serif 8pt, and the aspect ratio isn’t right, but you get the idea.