(repeating myself: )
Sorry, different process. You guys really need to take a look over on APUG.org, and read Photo Engineer's posts on the subject. Seriously, he's posted a lot of really good info about E6 and C41, and stuff like that.
A transparency requires the light to pass through it. Pigments block the light. That's it, light stops there, does not pass GO!, does not collect $200. Pigments reflect light, so they can be used on a final print.
The original Autochrome plates were dimly viewable against a light box. The Dufaycolor film used a printed color matrix. The best route to a home-made color film would be the Dufaycolor process. We have inkjet printers that can print on glass and plastic. This would then be coated with the emulsion, and there you have it.
As for Autochrome, the original machines are still in France. They tried to get the process going again to celebrate the centenary, but couldn't get it to work. There's a fellow who has done his own Autochrome, and there are scans on the web from his results.
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