This is inspirational work. I hadn’t thought the Sense connector would be available as a CAD/CAM component but it clearly is. I was also confused initially as you’ve used a 30-way connector and the Sense connector is 34-way and by the pin numbering which is quite different from the Seeedstudio schematic numbering. But then I realised the 4 outer-most Sense connector pins are just extra GND and VCC pins and the numbering actually works if you squint hard enough!
I wonder if there’s a way to re-engineer the Seeedstudio board retaining the camera connector and Mic but adding control of the Powerdown camera pin. That might make the OV2640 useable in low power applications given that the software standby feature is broken. It doesn’t matter much to me now as I’m happy switching to the OV3660 but it could be of interest to others and maybe you could sell the design back to Seeedstudio 