Good Morning, RW,

Several decades ago, I made a number of large prints using the method you are contemplating. My finished prints were approximately 30" x 40" on Ilford RC paper. My homemade drum is about a foot in diameter; I rotated it manually on upturned furniture casters mounted on a base. Everything went fine, except that washing was a pain. I recall taking the finished prints outside and using a garden hose. I think that Robert is probably correct about FB paper causing problems, since it lacks the springiness of RC.