Very cool,
I have used these for a while now and found this method fast and easy to setup and use in both design and cam ops.
As you mentioned you can add holes to design to hold parts or use existing opening with screws and washers or other holders.
"mini pallets " I call them was the reason for buying tc unit and learn tapping setups. 110 holes on each and I make 3 or 4 at a time.
I make them in both aluminum and acrylic in a couple different sizes but mostly use a 5x6 that fits in vise best.
The holes 0.5 on center and squared edges. I use a machinist square clamped to pallet for aligning parts and tighten screws down.
Also have these as fixtures in cam software along with screws and washers to include in models for tool path avoidance and checking
Just need to be carful on depth to avoid milling pallet surface to much or needing to resurface it.
Some pictures of my pallets
Anyway great to see others using this method, I was wondering what others did.
md