Jason, although I'd seen the video before I had no idea he used a Sirius in that. Amazing.
br, that would be interesting, I'll message you my email address.
Old School, as I understand it they still crop up for sale now and then, it was called the Alco Firefly. The IWM has a few in its collection including one with an interesting back story of having been used as part of the Czech Resistance during ww2, although I believe many were used by the SOE. Although the generating set itself doesn't look too cumbersome the boiler looks very painful to have to lug around.