Hear, hear! You are growing an impressive tree of dankness!
I used a 5 gallon bucket turned upside down to get my tomato out of a 7 gallon smartie (Nugs' tip). I wonder whether you could use a small outdoor table or half barrel to do the same thing with the 100 gallon? Why waste a perfectly good smart pot if you don't need to?
Take lots of pictures!
Cheers,
Mo