I think that in order for this to compete with formats like WorldA and QBAM, a few basemap types are needed, especially for WorldA and WorldAA.
Off the top of my head, I would find these most useful for making maps:
- Topography (mostly done already)
- Rivers (highly needed)
- Climate / Biomes (mostly done already)
- Political 1800ish
- Political WW1 / 1910s
- Political WW2 / 1930s
- Political modern / 2010s (done)
I’ll try to do a river EqualA, i’ve Already spent way too much time using a personal equal earth river base that i may as well do it