If I may toss out an alternative direction for consideration: What about a display that replicates the look of one of the real HAL panels? For example, something like this:
Or even this (sorry about the image quality; it's the HAL panel on the pod bay test bench):
The display screens around HAL could be simple lighted transparancies. They wouldn't alternate, of course, but I think they'd still look pretty cool. Collectors could choose among various transparancies and maybe even switch them out from time to time for variety. (I'm partial to the antenna display myself, as well as to the Discovery silhouette (not shown here), and various three-letter combinations: COM, HIB, NAV, etc.)
Of course, this sort of approach would result in a more expensive display, and also the need for a power source other than a couple of penlight batteries. And now, having proposed this idea, it's become clear to me that keeping down the cost and need for power were two of your objectives in designing the display the way you did.  :$[/b]