Hi Ali,
I hope you are well and the work goes as you want. I can’t wait to acquire and test your plugin.
Did you acheive to implement the material system you wanted? Have you began to work on the tooling?
I would like to share my personal opinion : Procedural generation is very fancy and impressive. It allows to create great demos and incredible screen-shot in no time but it can’t make a good game alone. Hand-crafted world are much more valuable in most case because they are an artistic expression and perfectly fit the gameplay goals. Few good games were able to take advantage of fully procedural biomes (Minecraft, Rust, no man’s sky). Few games need a 200km square landscape. And mixing generated and hand-made content is still a recurrent and unsolved problem for the procedural content generation industry.
So it’s totally awesome that your plugin can make such things, but I encourage you to focus at least as much on the in-editor tooling because I believe that there are tons of artists, out there, that can’t wait to sculpt, dig, paint and decorate in tiny details their (not-giant) level with their heart and a rich and versatile tool ^^ (Plus, a good in-editor tooling is exactly what is lacking the leading concurrent Voxel Farm 
)
Good luck and please, keep up the good work !