Here is some progress on CSG brush editing.
I decided I'll keep brush editing convex only for now, I really need to finish this plugin!
There's nothing that stops me from adding non-convex editing later on, it just means I need to handle a lot of of edge cases and that takes too much time right now.
As you can see in the video I also improved the grid rendering.
There are only some minor technical issues that I need to fix and then a list of trivial issues + polish.