Mark, your bike looks fantastic! Do you mind telling us how much it ended-up costing? I've got a very sorry looking '73 850 Interstate in desperate need of restoration, so it would be useful to know, before I take the plunge. Unfortunately, there's a lot more parts missing on mine, so it's going to hurt!
Managed to ride it up and down the road a couple of times last night when the rain in the North West of England briefly relented. Still some fine tuning to do then get it mot'd so I can register it in the UK.
With regard to quikbrew's question re cost, probably just short of £10k plus a huge amount of my time. Not cheap but not an issue as I have enjoyed every minute of it and would not hesitate to do it again.
The help, support and knowledge on this forum has been second to none and I am sure the build would have taken significantly longer without it.