I go in cycles with my building and will focus on 2 or 3 rods at a time. Right now I am working on 3 rods. The shop gets pretty messy when I am in the process of building. After the three rods go out I will take a week or two to clean up the shop and do any ordering that needs to be done.
Here is a picture of what I use to hollow my rods with. It is a Curt Elder hollowing mill.