This is the bike with the extended swingarm, and some handlebars from a Yamaha FS1. Along with the new tank and bigger front wheel/tyre combo, I think the bike has a nice stance now.

I bought some cheap pre-bent 1" tube, cut it up and welded it together to make a nice curved end to the cut off seat rails. Once this is welded onto the frame, I can work out what to do with the rear mudguard and the struts which are going to replace the shock absorbers.