Creating supports for a cut in half fatty tube

So i recently acquired a fatty tube (not gonna say how i got it) and I'm tempted to cut it to get 20ft out of it instead of 10ft. Its 12inches in diameter so if i cut it it would stand 6inches high (do the math). I need to be about 14inches high to match my lip. How do I make supports for such a wide cut in half tube. K+ for answers as this cult is dead