Raven is basically done. Designed for an old fat guy (me). Predator 4 stroke, home-built gearing. I'll happily provide additional pics or answer any questions on how I did what.
Yes, I've had great luck with the Sturmey Archer front drums. It came from Lynn @ Custom Motored Bicycles, Greendale, Wi along with a heavy-duty rear wheel/coaster brake.
Thanks
Barry