Try and get your hands on a piece of high tensile spring wire (piano wire) straighten it out and put a 45 degree kick bend on the end of it just enough so that the end with the bend will fit in the tube. Put the other end in a drill and " roto-root" out the tube
More progress... tank is now securely clamped to frame at the rear, seat brackets also installed and presto! I can sit on it again!
Still a little wonky, so needs adjustment, but that is a matter of fettling...
I have a found a set of Tre K Amazonas Marzocchi front forks that seem to be long enough and they look great (black outer top and gold inside tubes, with triple tree). Currently discussing with the italian owner (in Google-translate-Italian!) to confirm the length and condition, and then price.
I am now also in the market for a good radiator and fan, but these parts are scarce in the UK, plus expensive... (parts in the US are so much cheaper, but shipping and duties upon entering UK sometime make it non-viable).
I also now need to think about the coils - I have none, so need to buy three... any recommendations greatly received.
I have the M-Blue on my bike along with a lot of other Motogadget stuff and it has worked really good. However, it is a bit of overkill unless you are doing a complete new wiring harness as it will give you almost unlimited options. So for example -you may want to go to LED lighting and therefore use much smaller gauge wire .