Thanks blokes...all interesting stuff.
I like the look of an early BSA bantam tank, I just need to measure one up. Believe it or not they a made repro in china!
The rigid rear is on its way to me, with a few other bits. I got myself some wire wheels, which I'll get stripped possibly this weekend. I'll get 2 new 18 inch rims & spokes, then get the hubs polished or powdercoated.
This bloke is apparently the man for rephasing...I'll get him to do the other one but the one for the bobber will stay stock...but he will probably get the gig to sort out cleaning the head & replacing valve guides etc.