I would also like to thank you for showing photo's of your No.5. I have a well used 4/45 Faz.
IMO, how a person stores, displays or photo's their firearm(s) is his/her own business. As long as he/she feels they're safe then that should be plenty good enough for the rest of us. I keep certain rifles, shotguns and pistols from my collection at various locations throughout my house and cook shed that are not only cocked but fully LOADED as well. Safeties engaged of course.
I learned during my Millwright apprenticeship that as long as a spring is properly made from good quality materials storing it under tension has very little to no effect on it weakening over time. Working the spring is what leads to eventual fatigue and failure.