I think there would be a market IF you could also manage to make this rack visually pleasing. Something you could put against the wall and have it look beautiful. Living room worthy, esp. since those wouldn't be racks depending on high ambient room temps.
Sort of like a hybrid between rack and cages. All the features of a rack that makes seclusive snakes such as Ball Pythons feel comfortable, easy to maintain husbandry and ease of maintenance PLUS a bit more visibility.
For a high price I would expect top quality. Nice finishing. No rough or sharp edges, shoddy craftsmanship, etc.
I would expect custom tubs. The reason being, I would want them clear. As clear as possible while maintaining high quality. I would want the typical floor measurements BUT an additional 3 or 4 inches in height. Some kind of recessed light rope with the ability to choose between white light (for a quick checkup) and red light, to be able to watch a bit at night without disturbing the animal. Not something that is on all night, just when wanted or needed.
The tub would still have to be easily slid out, without disturbing the light/heat. Not sure how that would work with radiant heat? But that would be non negotiable, or one could just go to a cage..
Having it somewhat adjustable would be neat. Lets say you could fit in one adult tub, or switch out to 2 juvie tubs or 4 hatchlings..etc. Tubs would have to be readily available for purchase.