That's more pages than the actually crunchy rules portions of even a fairly heavy-rules system's core book.
At this point your are basically making your own game, which is cool. But if you are writing 100s of pages of rules for a system to make it work for you, it seems you've abandoned it in all but name.
Beyond the Wall is so good. Still waiting on them to release their dungeon book for Grizzled Adventurers, although I'll likely just use it for Shadowdark now.I abandoned 5e DnD after two years of playing and DM'ing - this after 40 or so years of playing DnD from Ad&d onward (skipping 4e and 3.5e). It was too much work to change up to fit our play style, and was distinctly unfun for many of us.
I went back to B/X and OSE Advanced/Beyond the Wall, and tinkered with those (wow, looks like I'm just retyping @The Soloist 's post -), and am running in several pbem games in the same setting.
We're now going to try out things like Aliens, Shadowdark, Symbaroum, Warhammer Fantasy Roleplay (2e), Pendragon, etc., to get to those games that do what we're looking for. We might check back in to OSE again and again, but I'm off the treadmill.
Yeah, I adapt every game to my preferences anyway, and D&D is the most common touchstone so that makes it easier.Upvoted for old-school Midnight Oil reference.
I'm more likely to stick with D&D because it's the easiest thing to find players for by far, and that's a major consideration.