I'd be super interested in trying this sometime with some of that new Aerocolor that is being rebranded everywhere. I think it is C-41 with a clear base but takes decently well to being x-pro'd as slide, and it's cheap enough and plentiful that I wouldn't be sad about wasting some compared to my sweet sweet Velvia.
That's super cool. It looks like the OP got some decent results with Ektachrome, if a bit washed out. I wonder how much the saturation loss was due to the film being expired vs. the processing. I've never tried this but look forward to seeing how yours turn out!
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