El rol nos cría y el viento nos junta :p Yeah Knave 2e has become my default “D&D-like” game for dungeon crawling and general B/X compatible gaming. I’ve hacked it extensively too, there’s just something about dungeon fantasy that keeps me coming back and that ruleset specifically may not be the most elegant or innovative but it’s certainly extremely functional.
Out of curiosity, do you run your west marches in spanish or english? If you are interested we might exchange hacks and house rules some time :) Anyways, saludos desde Argentina! Very much looking forward to your next projects, your art is awesome!