I wouldn't change anything on my system. I have a simple on/off switch the controls a 30 amp contactor. The switch is no more than a single step from any of my machines.
Link to my cyclone build and install.
Link to measurements of my system.
I used snaplock pipe and would do so in a heartbeat...
Since I have gotten into restoring radios and console stereos from the 1940's to the early 1960's my YouTube list reflects this.
Depending how you use the card scraper will dictate your surface finish. Going parallel to the figure will give you a wavy feeling but skewing the scraper will make it as smooth as glass. We run into this all the time working on guitar bodies.
We have been having some problems lately with the finish bubbling on the inside corners of guitars that are being finished with lacquer. It happens either at a neck joint or at the bridge on a steel string guitar. We are at a loss as we have tried thinning the lacquer more and we also have tried...