This is such a cool website!!!
They have instructions on how to make your own storage rack to rotate cans.
It has a "first in first out" with a top loading design!
It uses nothing but cardboard you could find around the house. FREE!
Visit their site for complete instructions.
And one of their readers offered another suggestion for a large can roller system in a very slim space.
Look at this DIY from Jayce that can storage you can build in a weekend.
It still features "first in, first out" principles. Check out the website for instructions and more photos.