Not only do you have to glue the voice coil on (or attempt to), you apparently have to remove the original dome from it's frame and attempt to glue the new dome to the frame. This means, of, course, if you make a slight mis-alignment in attaching the whole new assembly together, you have probably just destroyed a driver. There likely won't be any reattaching the original dome after that.
Additionally, if there is a successful glue, there will be a wide variation in workmanship. Invariably, some attempts won't be successful. Like post #9 Skylab said. And, how will various levels of workmanship affect the performance of the driver?
I wonder if these have been engineered and tested to align the T/S values and sound characteristics with the original. This is the first time I've heard of someone making a dome or diaphragm out of silicone. I looked at the picture of the dome being (what appeared to be freely) twisted, and it seems odd that a material with such a lack of rigidity would be successful at the crossover frequencies in question, like 5000Hz for some of the Kappa's. This has to do with the center of the dome decoupling from the driven edge portion and essentially acting out of phase with the driven portion at high frequencies. I'd be really curious about that. Equally as curious about the low crossover frequencies, too, regarding the rigidity of the dome.
Just a couple thoughts.