The true Django Guitar was the Selmer Maccaferri, which came in several models. No longer made, but there are lots of copies, ranging from high end luthier built stuff (John le Voi and others) to Korean cheapies. (Gitane etc). The best compromise (I think)is a line of guitars being made in Korea to an exact Selmer specification by an outfit called Manouche Guitars, based in Cheltenham, England. John Vickers, the co-owner, is a Django nut, and he went for a no-compromises approach to the design; so much so that some of the top Django style guitarists have a lot of trouble telling them apart from the real thing (both visually and sonically). Wesite is here . Probably the loudest guitars I've ever heard in my life. No financial interest, they're just great instruments. Also, Fylde make a guitar that looks like a Maccaferri, but is in fact a conventional acoustic guitar; called the Egyptian, I think. Not sure what Steve Goodman played, but my guess would be a Maccaferri or a contemporary copy; no-one was manufacturing this kind of guitar in quantity at that time.
Hope this helps.
Tim