[morzh]

Ed, it will surely sound. I think it will sound more akin to those large table speakers with cones made out of cardboard.
A 16 speaker if the cone survives, as well as all the old speakers that have their cones intact (amongst those are the 37-116 speaker that sounds just spectacular), that I encountered, sound great. A 16 is a great radio with a very good output and it will sound like that cardboard speaker whereas it could sound really bright.
I re-coned my 16 in a pro shop with a todays cone, but if you are bent on doing it yourself, my advice would be, use an actual cone - they do exit in proper size today.
If we were talking about a 1920-something radio, sure, but 16 is considered the best tabletop radio for a reason, and when put in a console cabinet with a larger speaker, it is a superb performer.

You did a great geometrical job, but sorry to say, geometry alone won't do it.