FWIW I use rigid PVC pipe 3" diameter with end caps for my 7X17, and roll them in a tray of tempered water. Solution changes have to be in the dark, but it works well. your film would need 5 or 6" pipe depending on which way you insert it.
How many 8X10's does a liter of pyrocat hd develop? One sheet of 14X17 is about 3 8x10s in area.