Last night I started working on an ESC/P to BMP project. Wrote the thing in about two hours, at least something that handles Print Shop. I'm just trying to figure out if it's something worth working on because there's the Retroprinter project, Atari800MacX already does ESC/P->PDF, and there's APE. So who exactly would another project benefit? The Altirra project can pull the Retroprinter open source and use that if they really wanted to. I don't want to reinvent the wheel.
EDIT: And then there's the font issue, both the fonts themselves and rendering them.
It would be useful perhaps to add to what JoSch (sp?) is doing for RespeQt.
Not sure what your font issue is - the "Atari 8-bit" type fonts have been available online from the author for over 15 years or so, free to use if you give him credit, I believe. Every 9-pin or 24-pin dot matrix printer used basic variation of the same fonts - it would be dead simple to "reverse engineer" them with graph paper and skip any supposed problem with using them. On the other hand, the Internet being what it is, I would be very surprised if someone hasn't already created an entire family of TT fonts that look like dot matrix Courier, Elite and Roman type fonts already and made them available under CC licenses or even free-ware.