Thanks for the Welcome,
Rick.. Thanks for the compliment, The tank and forks came from Pat I bought the frame from a guy near him and Pat had a look at it and was going to loop it but I decided to go this way. Pat does some fine builds.
Not sure of the model of the bike as this is My first go at these, but I think the bike is a 49. Plans do look like a Briggs to start , and try to find a Simplex along the way.