Dale, thanks for that. If the Givi rack goes above the handrails with spacers, it should go over the Yamaha rack too. I wasn't sure if the Givi fixings would interfere, but it looks like they won't. As I will be almost certainly using soft panniers, the light construction is exactly what I am looking for. If I do upgrade to hard panniers in the future (and I'm happy to lock into the Givi system for that), then it will be for civilised tours only - just somewhere to put the DJ and cucumber sandwiches
Graham, thanks for the tip about the fixing nuts. Captive nuts rock, at least until they get corroded and have to be drilled out. Advantages both ways
Cheers for the replies, very helpful.