Hi Paul, Good to see that the Trike conversion is getting started. I had a Grinnall trike a few years ago, based on the BMW R1200C. Great fun but I was not happy with the fuel range. You should find the F6B much better in that respect. I seem to get about 50MPG no matter how I ride it!
What are your plans for the bits you are removing from the bike? I am looking forward to seeing your photographs of the build.
The Billy no Mates won't work on this Forum. If you own a F6B you will find you have many Mates.