Rear wheel turning in neutral ?

[bludclot]

I would suggest that your rattle is due to loose springs in the back of the clutch basket. I had mine welded and my clutch has been quiet ever since. Your creep and wheel spin must be related, I would suspect worn basket fingers - the clutch plates tend to wear shallow grooves in the basket fingers and it doesn't take much before the plates become reluctant to slide causing the exact symptoms you describe. That's the end of the good news however, it's not a solution to file/sand away the the fingers back to smooth as a good fit between plates and  basket is required. A very small amount of sympathetic filing improves matters but doesn't give back factory performance. New baskets are available but eye wateringly expensive. When the above is considered, used baskets should be considered with caution unless it's known that it's come from a non-abused low mileage engine.
Bear in mind also that gen 1s are clutch cable sensitive. Even decent after market cables perform badly giving creep and hard to find neutrals despite being fitted to a healthy clutch. I figure this is down to the (from memory) four right angles that the cable has to negotiate from lever to casing. Genuine cables are available but, again, expensive.
A  healthy clutch gives quiet, smooth operation with minimal wheel spin in neutral, no creep and easy to find neutrals.