I've been working on the tank mounting. Following Matt's (IIRC) advice I've got a length of 8mm allthread that just fits behind the little tags in a hole in the frame above and forward of the standard mounting position. The CX500 tank is wider between the bobbins than the original, strangely enough, so I've made spacers from black nylon to sit on the studding and push the bobbins out. This is well nigh perfect at the front, giving about 10mm clearance from the forks on full lock.
I've also been thinking about the side panels and discovered that if I lift the back of the tank about 10mm the panels will slip underneath and look almost as if they're meant to be there. I need to find some way of locating their front mountings however.
Also picked up a set of aerosols from Spraywell in Bromsgrove, matched to a side panel. I've never used 2 stage paint like this before. What can go wrong. The pack also includes an allegedly petrol and UV resistant lacquer. All for £60 - a lot but much cheaper than a professional job. Will it look as good? No......
Pics of the front tank mount: you can see the original bobbin mounts.