This poor project has languished too long.  I apologize if anyone has been waiting for the info I promised months ago.  I have actually used the camera but the documentation was waiting to be pulled together.  As well as quashing a niggling bug in the PRU VoSPI code that prevented it from properly syncing with the Lepton on occasion.  Over the last couple of weeks I finally had some spare time and updated my github repository with a detailed description of the camera, the modifications to the Solar Pi Platter, enclosure design and initial software.  Please head over there to see a bunch of new info in the "pocketgbeagle" directory describing the camera build.

Next up will be to start on what I hope to be the real application software for the camera including a touch interface for the LCD display, and remote access through a web browser as well as custom desktop application.  I'm going to try to make a modular architecture so that parts of the code can be used on existing Beaglebone and Pocketbeagle computers with the Lepton 3.5 without having to build a bunch of hardware if one doesn't want too - for example to make a thermal-imaging webcam.

Here's the schematic of the camera.

And an exploded view of the openSCAD designs for the 3D printed case.

The existing program, pru_rpmsg_fb, used to display the video stream on the LCD display and necessary support files for the Pocketbeagle are also in the respository.