Nice job, Will. I have read through your write up about how this was done.I have made many Celtic cross condiment mills and a lot of segmented pieces, so what follows is from experience with these. You mentioned about feeling the veneers, even after finishing. You will probably find that they will feel worse or protrude more after a short time. When pieces are glued like this the moisture in the adhesive causes the woods to swell. When it is dried on the outside it is still ‘damp’ inside. Turning down exposes the dampness and although turned smooth will swell somewhat during the drying. Leaving it for a while and then returning to the lathe for a final finish usually improves it. Having the grain in the different woods running in different directions also does not help. The swelling happens a lot with segmented pieces, where after finishing, you can feel the glue lines as they have swollen up with the retained moisture in the wood. Refinishing after a while usually resolves this.