I had read a post where you are thinking of putting up shelves, and thought you might like to take a look at this..it's called Versalift, if you go on youtube you can find one like it a guy made..just look for attic lift. I don't know if your husband is handy building things or not. I am having mine build one , so I can store my roses in the loft in the garage. To build one would be around $200.
Also I was curious about if you bury your grafts on the roses you have in pots?