I don't actually remember why I never mapped the Hero's Cave in this game. Then again, I remember being under a lot of self-imposed stress at the time, trying to keep up with Revned and probably obsessing over a whole bunch of meaningless details.
A few years back, I played with the idea of doing specific area maps that would include every seasonal variations and also every cave and building interiors. But then I got upset because the regions as they are defined on the minimap didn't fully correspond to how they are separated as separate seasons as you played, blah blah blah... Like for the first time, meaningless details.
I can't promise anything, but I'll try to get the Hero's Cave done over the next few weeks if you can wait that long. Thanks for the interest by the way!