Thanks for the new reply.
I've taken all the cameras and lenses that were in leather cases (I'm working on the theory that tamron lens cases are leather with a type of stiffening and padding in) and it was a pain in the 'arris trying to decide what to put where. I settled on leaving the lenses in a gadget bag with the lid open, the two leather cases for my folders in the bottom, detachable, part of that gadget bag with the double zip thingy open and two of the lens cases on the bottom shelf of one of my bookcases. I did this with the view that it doesn't matter if the cases get knocked of the shelf but it might if a camera or lens was.
I've left the lids of the plastic cases open but with the lenses still inside as there really is nowhere to shove them.
An ever-growing amount of photo-stuff and a never-growing amount of photo-talent.