Thanks to everyone who replied. There were a lot of good points brought up for me to think about. At this point I see two main problems. If there is flex in the Laguna articulated banjo arm that seems like a bad thing. A big bowl gives the gouge a pounding until the bowl gets pretty round. The other red flag is the caution from Charlie and Jamie that the free standing tool rest might have a tendency to move or tip. I suppose I could brace the free standing tool rest.
--Whit