Behind the scenes........pics.

[Sunset Machine]

I did exactly that with a gypo face mill that came with brazed bits, milled out some new slots and setscrewed HSS bits in there. Works fine but I should have just started from barstock. Good idea! I'll look into a 10 inch version.

This here is some funny tooling. It looks like carbide stuff but it's HSS:
http://www.arwarnerco.com/