He has made a combo unit housing both alternator and electronic ignition that he has put where the original magneto sits. And where the dyno normally is he has installed a starter motor from a car. I believe also the starter ring is from the same car. He has made the crank case bigger on the drive side to make it fit.
Some more pictures from the rally below. E.g. Neville Higgins inspecting the build quality. http://www.vincenthrd.se/Harhant/Olofstrom2015/Olofstrom2015-44.html
As you you see on the plate on the engine it is EHV-003 meaning Ernst Hegeler Vincent no. 3. He had made 2 engines for him self and a Swede managed after 1 year of persuasion allow him to buy this engine no. 3.
Hegeler makes the crankcases, top ends, the alternator/ignition combo unit etc.
He sells some of the parts e.g. the alternator/ignition combo unit. His site is being updated for the moment as it seems but you find it here:http://www.vinsparesgermany.com/