Hi Murdo,
I have been meaning to provide an update, thanks for prompting me to do so.
I have purchased the gas tank and the gas cap, waiting on delivery of these items! I will post a picture once I receive them. So that is a MAJOR component I needed and thanks to Jean-Luc I should receive them soon. Some parts of the search are frustrating - I think because I don't have an address in France I can't completely use Leboncoin, plus not speaking french makes matters a bit worse. But I have been looking on french ebay as well. My wife is buying me the tank and cap for xmas!!
I have been finding a lot of ETD parts, ETM less so - mine is an ETM. I need the oil filter/tool box and battery holder, so I am keeping an eye out for those. I also need all the nuts, bolts and screws that will hold everything together. I decided I will probably purchase a reproduction set of handle bars, as mine are so rusty it will cost me a fortune to get rechromed. I also need to find a new/used crash bar as mine is very rusty as well. I wanted to keep this as original as possible, but am weighing the costs of doing so.
I will probably take a small metal part of the bike and work on stripping, sanding, repairing and base coating the part. This will give me an idea of what I am doing and the work involved.
I have been talking with a couple of places that do rechroming and have been searching the internet for "metal repair" information.
I think that is it for now - will post when I receive the gas tank - a 35 year wait will be over
Joe