Thanks to all for the great responses! I do have a few questions, however ...
James: what brand is your three-guitar stand? It looks similar to the Hercules stands.
Oliver: Do you have any pictures of your stand? And do you have a website I can go to to take a look at it?
Val: I have a friend who has a multi guitar stand like that. I've tried them, and for Spyder and Exploiter bodied guitars and basses, they're a bit awkward. My friend has a Hamer Slammer (Gibson Explorer bodystyle) and an Epiphone Firebird, and they sit a bit awkwardly in the stand. Thanks for the suggestion, though. And you're right - I may end up having to make my own.
Again, many thanks to all!
Alan