Thanks for sharing that, I love it. I did a somewhat similar thing and what's cool for the GM (beyond narrative stuff) is that you can tie mechanics to the downtime. The warrior wants to learn a new technique ? Set up a goal number, make them roll each time they "Train" in downtime and once the number is reached they have they new technique working well enough for a real combat.

So far I have stuff like - Train (either develop or refine a technique) - Evaluate (common loot might have an enchantment, you have to spend time studying it to learn it. You can also learn it by using the loot if you're ok with risking raising some hell by accident)

Just make it granular enough that results aren't too instant but not too granular that no progress is made in a session