CrossRoads:
Ah. I wasn't thinking "dimension" as frame sizes. Thanks.
As a hobbyist, I am used to taping a mylar stencil onto a board.
I'm having a little trouble imaging how to ensure aligment of a 10cm x 10cm (or smaller) board inside the very much larger frame area.
For manufacture little PCBAs, it is very easy to align the board to the stencil, just like the picture
For assembling small batch of the PCBAs, we will panelizing the boards and using a clip machine to align the boards to the stencil and fix them. We are writing a blog about how the PCB assembly works for small batch of the PCBs.
Another good news is our PCB services support same boards panelizing, only need add little money, and you will get double or more boards, especial suit for the boards with 510cm dimension, for example, you only need to pay $31.9, and got 20 separated 510cm boards or 10 10*10cm panelized boards which with V-groove. For the boards which with V-groove, you don't need to cut them buy yourself any more.