Should try to look at one in person, that might be good for parts!
If the gauges are decent Humidity and tempature are worth a little, mount them on a nice wood frame. A compass is always handy.
The cups, if they are decent then mount them on a VCR head or Hard Drive motor, attach the magnet and set up the bike speedometer
If the cups just sit in a dove tail as mentioned then epoxy them on, as long as they are decent balance and size.
I would buy one but don't have a local store, shipping is $7.39 for one! Total $22.37 for one, or I could buy 2 for about $40 with shipping, but dont want 2.
I don't want to buy them for that, but I have seen just the cup parts being sold for $20 and shipping some places but those are probably better cups too!