Jim,
Just finished reading the whole 29 pages - very pretty. I'd ask "Why not symmetrical holes around the center?", in your top-plate for coil, wick, etc..
Also, I'd mention - I have been eyeing my clearomizers and tanks for weeks.. I keep wondering why no one has thought to simply design a cap and base and mid-plate to use some standard, available tubing for shell/tank (I'm glaring at my ejuice syringes) and the "standpipe", (as I call the power/post up the middle).. Three parts and done: let the consumer assemble it to his chosen height/volume. At worst, you design two sets: tall and squat - clearomizers vs stubby tanks.
I keep staring at my Vivi Tank and the Vivi Nova - al that potential, kicked in the head. *sigh* I've also been eyeing the atty "heads" of my Vivi Nova and pondering who to hit-up for a lathe/mill job, but I sure like your work ;-)
Anyway, I salute you.. Been thinking of a Solder Rework Station, myself - and yes, thinking also of a "minimat" sort of lathe/mill used by serious modelers. No real space here at "home", but I can dream.