I just started this a couple hours ago because somebody on another forum commented on my maps and I realized that DOSBox is awesome.
Currently I only have one board done, but each Super ZZT world is only 8 or 9 boards big (and I don't see anything that would be a major hold-up), so completion of this project is only dependent on my free time (and motivation).
ZZT's Lost Forest (WIP)
(The screens were taken from the internal level editor while in DOSBox, spliced together, and then the whole image was stretched 200% horizontally.)