Storing VDI holders.

We are slow,So I am going to do some organizing.
What my question is how does everybody store their VDI tool holders?
Does anybody make a storage system like they do for CAT 40 holders?
Right now I have them on shelves laying on their sides.
I thought about making something myself out of wood with 2 holes one for the shaft and another for the locating pin.

Thanks,Bob