Corwin,
Thanks for the suggestions. I've only done a couple of test runs with it, so I'm sure I'm going to make some changes (in line with what you've suggested.)
I don't think it will tip over (famous last words), since the weight of the mdf cabinet counteracts the cantilever/reach of the arm. I was trying to match the height and reach of the festool boom as closely as I could, but I have plenty of conduit left over if/when I need to add some reach to the arm. I'll know more tomorrow when I start cutting up my next job.
As far as upgrading the hose...maybe next month when I close out a couple of jobs [big grin]
Once again, thanks for the friendly suggestions.