My current project is to do 30-40" prints. My film aspect is 1:1. I don't want to make temporary trays out of 2x4's and plastic. It takes too much space and will be messy. The only thing I know for sure is I will need 10" id pipe for 30" prints and 14" id pipe for 40". I haven't figured out the most cost effective pipe and how to terminate it and the least expensive way to spin for development.