Re: Neck plaster...?
Whether the material of the bore has significant effect on the sound of a horn is perhaps the greatest controversy of saxophonology. Unlike percussion and strings, where force or vibrating strands put the instrument into motion to produce standing sound waves, wind instruments produce sound from the vibrating column of air inside the instrument. I'm sure there is some effect from material, just not sure how much.
I understand that some people use large chambered bari pieces with bass saxophones with no intonation issues.