Thanks everyone!
Red, The situation is that I would like a durable stripped down bike for track days with the option to race. If I found a suitable period 5 great, but if it was a later one that would be great too. Due to my commitments I can't see the opportunity for me to travel off the island regularly enough to compete in any series other than to come over for the occasional event. I really want to ride Phillip Island some time too. The priority is durability so that I can continue to enjoy the whole Laverda experience into the future and basically stick with what I know and love. It will need to be a work in progress and I had discounted the possibility of aftermarket frames due to availability and cost. Certainly I would like more grip, better suspension, more braking power and engine power but the point is to get out there and not damage the pretty one with all it's re-chromed and painted bits.
If you say the RGS is stronger then that sounds like the go.