Late seeing this - but it is remarkable! The White Grass gimmick is great!
I'll echo other's thoughts about TG's lack of development.
I've wondered (a lot) recently if TG staff might simply abandon TG and declared it "Open Source" , and the code put out in the public domain for others to develop branches as they saw fit. We use to describe a product's viability in terms if "mindshare" which TG no longer has. The TG webpage that shows where TG was used features no projects later than 2019. It seems like the very small group of users & enthusiasts here are what's keeping TG alive nowadays.
I would love to see any sign of further development but it's just not there. Which is sad because TG still has an amazing render engine that stands out from the others.