Still working on this? 

Any plans for 1.21.x? 

This is way more complicated than i thought lol.

So i started out just thinking cool use the pre-existing snowlayer-4 to 7 that's essentially never used. But it wasn't deep enough.
Then I was like well let's do snowlayer's up to 4 blocks tall and then you think of the performance impact of 8 layer blocks instead of 1 1x1 block.
So then your like cool I'll use snow block and just convert after 7 layers of snow
But then the default everything breaks at that point. All the loose stone variants, do you keep or destroy player crops\vegetation, what about berry bushes that are now like gross looking 

sinkholes compared to their neighboring 4 block tall snow. Then do we save this data per block, make all new snow variants as none of the default ones are 1x1

And then we are now searching via string, so we need to cache them, save them with int 0(1) which is 100x1000 faster.
Then you realize the rain layer doesn't really detect all these variations snow then you need a harmony patch for that and the melting snow so your block's convert in reverse to layers.
Either that or you destroy everything with snow and "regenerate" it in spring which means re-creating the world regeneration.

I've probably made 3 different variations of full rewrites that are fully custom not using vanilla methods and a few trying to modify or use vanilla methods. Quite a bit of progress and hammering out what I

Want but definitely didn't think it would be a 2 week beast of a code mod.