Thanks for all the replies and kind words.
I've got some other feelers out now, including to Ron Klein, Kenneth Snelson, and a couple others, so will see what happens.
The old car / old bike idea is a bit of serendipity. Photos I've taken that people have raved about (and bought) have usually been those subjects.
Plus, my father is into old cars, ie, Model T Fords, repairs them for a living, is active in local clubs. 70 miles to the north of me is Greenfield Village, and its car and bike shows during the summer. The 100th anniversary of the Model T Ford is this summer, and a large event is planned about 120 miles southwest of here. Then 100 miles southeast is Mid-Ohio Sports Car Course and motorcycle Vintage Days. Other friends of mine are active in old bikes. So I have a network of contacts already in place, accidentally, and if I do good work I believe I can make the sale, and everybody will be happy.
And if I fail? Well, I've been considering a Cirkut for a long time (couple years) anyway.
Jamie Young - thanks for the offer of tips. A naive question, but wouldn't a 9:1 (96" x 10") negative apply only to a full 360d pano? Guessing at that because my stitched 35mm Widelux 360s are about a 9:1 aspect ratio. I'm betting I'd rarely go beyond 180d, and that would mean 48" negs. Pondering it all in my head, I'm thinking that big round black plastic trash cans in the bathtub could be used as developing tanks, and I could cobble up a big reel somehow, 10" tall. The reel would need a big handle, so it could be lifted out and /or turned for agitation. Inversions would be out... I don't know if tray development is practical, but I have my doubts, given the negative / print length. Esp. if negs or contact prints are longer than my bathtub.
Jason: my poor choice of words saying that a hi-res digi would be similar to a Cirkut. My thought was that to some customers, modern cam + stitching might be the same. But am hoping that among vintage car and vintage bike guys, the Cirkut would be part of the draw, and they'd prefer that their antiques be photographed by an antique.
Ideally, and this might be naive too, I'd like to be able to produce consistent results in 6-12 months. One incentve for that timeframe is there's a local bar & grill that burned down on Christmas Eve 2007, that I'd shot with the Widelux on one of their Bike Nights. Here's that pic, several copies have been sold, and a couple donated to a benefit for the bar owner where they brought a very good price.... Katie's Kitchen is now the final building standing on that block, the rest is just a dirt field.
They're going to rebuild on the same lot, if possible, and when I suggested to the owner a pano of his employees outside the new building, and what a cool shot that would be 10-20 years down the road, he agreed and suggested customers and employees. I could shoot it with my Widelux 35mm or my Kodak Panoram, but I think I could shoot it much better with a Cirkut.
I have ideas for other uses for the Cirkut as well. Re-photographing some small towns that were shot 100 years ago on Cirkuts, small-town gatherings, a full 360d of Mid-Ohio Sports Car Course during Vintage Bike Days... stuff like that. Demand already exists for my smaller pano work, and I think I could translate that into demand into Cirkut work. Crossing my fingers, anyway.