These shells will have an impact on the sound, that is for sure. Hopefully it will be a positive thing. Also, it would channel all of the driver sound to your ear canal, something that earbuds generally struggle with. They are the most comfortable thing you can put in/on ears, nothing comes close to them, you feel their weight, but they stay nicely put and there are no edges.
I am gonna do this a few months from now, so, it would be nice if you could take a few photos of your progress. I have a few concerns, like, how would the driver fit in the housing. Potential issues could happen if the driver is too thick near the edges and the casing wont fully close. I'll put some photos here from aliexpress feedback post, 16mm driver that is not exactly thick wouldn't fit. Vido driver is 15,4mm, but it has plastic around which is next to impossible to remove without damaging driver, so it would have to fit with the whole plastic part. Maybe I could "shave off" some of the plastic around driver without removing it...