Few years ago I decompiled like 70% of S6 main as IGCN team member. I had literally everything I wanted from this game, file formats, whole render (maps, objects, effects) and internal structs (items, game objects like players and monsters). Parts of this decompilation were included in IGCN S6 Dll with custom monsters and other stuff (we called it silver edition). I decided to drop this project, and to move everything to external project where I tried to rewrite MU engine (basing on this decompilation). While it was very successful I realized that writing engine itself is just waste of time. Please don't repeat my mistakes, because this engine is literally black hole.
Later I moved whole project to Unity engine. Today after few more years, it's still not ready. This is not something you can code it one one or two years. And larger team won't make it any better, maybe more chaotic. After all this years I'm sure that community will never finish such complex task. Actually publishing SRC would kill that project. Look at other MU projects. Most of them are successful because they are one-man projects, or are made by very hermetic teams like IGCN. Even Deathway 0.99.60 decompilation (which is probably the best thing that happened to this community like 10 years ago?) it wasn't large community project, it was mostly two guys with some help (correct me if I'm wrong, it was long time ^^).
I can share few screens from our work:
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While It's playable, it's not even close to be finished.