made good progress, the currently unreleased rewrite now uses the headers for SML2 and SML3 to load all resources unlike the older version that was half hard-coded. I also found a missing header for SML2 that defines the tiles for each level finally!

here is a sample of a SML3 level:

And here is a SML2 level:

adding the remaining details is easy (done it before). So not long now!