Looking for something to put in this space (PDP-11)

[Charles]

Here's a pic of my PDP-11/23+ system with two RL02 drives. There
is an empty space about six inches high below the second drive, as
you can see. (In the rear is a power controller and a panel with
16 serial ports, although I don't have anything to hook up to them
for now).

http://i18.tinypic.com/4pc8sux.jpg

I'm looking for either a blank panel to cover the hole, or maybe
an interesting device I can fit there, if anyone has a suggestion?

thanks
Charles