i used one for a while with a CPVC manifold at the bottom, it worked well, but i made a few mistakes
I put a larger spigot on it, which was fine, but i glued the manifold to that. Going back i would glue the manifold together, and not glue it onto the spigot, it would allow me to remove the manifold to clean, as well as removal of the grain. After only a few batches i broke the manifold while trying to empty the grain. And decided to go to a metal manifold in my new MLT. Which is a completely different animal. The CPVC is by far an easier and cheaper route than what i had done, and would be good for your situation.