idk if it's in the spirit to rate this but since you want feedback: a promising start and a good idea, I think this could end up a very useful resource for a lot of new guides. The base rules describe the fog evocatively but don't provide much mechanically, so I'm sure there's a lot of guides (esp. those coming from games with fleshed out exploration rules) who are already wishing they had something like this.
I'd echo the dice thing though: I'm one of those people who'd prefer to stick to the game's base dice so if there's a way to turn those tables into d5/d10/d100s that'd be a plus in my book.
Overall big encouragement to continue and finish