The vertical racks under the window are made from rings of 1 1/4 PR200 PVC cut in 1/2 inch increments and screwed to a !x2 board. The rings on the base section are solid. The rings on the upper section have a slit cut in them. This allows you to put the rod butt in the base and "clip" the rod in the top holder.
The vertical racks on the walls and ceiling have slits on both of the rings. They are also larger diameter because they are primarily for larger spinning rods. I also mounted them directly to the plywood walls of the shed.
In hindsight, I probably would have used 1 1/2, some of the butts are a little snug. I mounted them on the board because I could build it at the bench and then just secure to wall with 4 screws. much easier to keep plumb & level.
I had this building built after Michael destroyed my boat shed. The builder said it had ab 8 ft ceiling and it does at the peak, but the walls are 7'8", so all my 8' rods were cramped.
Also , if you have the room, I'd put a board on the floor for the butts to rest on
The ceiling racks were a good use of space, but I have a ceiling fan in there,so gotta be careful