Poor man’s ATC here: RapidChange ATC: ATC for ER20 (and other) spindles
Not sure if anyone here has played with it on the new EX controller, but RapidChange do have a centroid version of their software so it should be do-able.
I do a fair amount of sheet work, and have used everything from clamps and dogs, to double-sided tape, to screws to composite nails. None are ideal.
Those wavy sheets tend to spring up a bit when cutting and bits of them are released from whatever clamping method you use - so you can lose accuracy (or the whole part in some cases). A vac table is gong to be best as with your cabinet parts, you’re usually going to have a decent vac surface area that will keep the panels flat, even when they’re separated from the main sheet.
I have some vacuum motors to build a vac table somewhere down the line, but as you say, it’s a bit involved. Or you buy a ready-made unit, which is slightly less involved, but still not plug & pray.
If you have a vac table, and want to do other things that use different clamping methods, you just have an additional spoilboard with dog holes/t-tracks/whatever that you place on top of the vac table. You lose a bit of Z that way, but that should only be a rare issue.
The advantage of the Avids is they are adaptable and configurable to whatever whim takes you this week. The disadvantage is you’ll need to do a bit of work to realise those whims. Lots of help here, but they all take time, so you’ll need to decide how much time you want to spend playing with the CNC vs how much time you want spitting out cabinet parts.
But once it’s up and running, the parts will fly out… provided you don’t come up with the next bit of tinkering…