Won't the substitution of a cooler light source result in colour temperature and gamut complications? The colour of those old slides shown above looks gorgeous by the way.
How would the results from photographing the projected image on a flat screen compare with what you've done so far? I realise it wouldn't be high resolution, but as you've got a couple of megapixels worth, so far, is it worth making a comparison?
I don't know a lot about Carousel projectors, but am aware there were various lenses of greater or lesser quality and in at least some cases, the option of installing a better than standard lens. And that the Ektagraphic models tended to have better lenses as standard equipment. Hence I suppose the results from imaging off a screen would have to depend partly on the quality of the projector lenses you have access to.
It seems that once set up it would not take much if any longer to record the image off a screen compared to what you have done above, so perhaps it's worth a quick comparison?
Generally, do members have much interest in Carousel projectors? I've ended up with several projectors of varying quality including a Leitz Pradovit and Rollei P-11 but have always admired the Kodak Carousels. A year or two back I was gifted the very first model Carousel Kodak marketed, in fully working mint condition in box. I believe identical to the example which featured in an episode of
Mad Men. I was surprised at how well designed and featured it was for its day. It's far from being the best Carousel model for regular use in 2019 (parts, etc.), although, I have used it a few times. But I can post up some pics of it in a few weeks when I'm back on my feet again if there's enough interest in seeing it.
Cheers,
Brett