Mark, it is ironic that you brought this up..:) I just tried the same thing last week, except it was a brake.. After drilling the hole and using a boring bar to set the final I/D, and it was all done... I did not like it... LOL.. So I just cut the O/D down to a round brake...:) Maybe I should take another try at it. It just did not look right to me with a round shroud.. :)
Way to go though.
Looks like you can do anything with your Lath/Mill
Gene