Nice SotF! A much grander scale than mine. Looks like you gave it more effort too 
Yeah, mine's more of a fantasy or scifi thing (or giant redwoods), and needed to be taller than yours seem to since there'll be a lot of larger things there.
But for actual effort, they really weren't that bad. Most of the issue with them is all the times you need to leave it to dry. I keep considering making a few more specifically to cast up and perhaps sell in the future.