Perfect, this thread will be very helpful.
Maybe i can help with this work, im not good with drawing, but if you need help for something like to read the datasheet and put the pinout with default and alternate functions on csv or an excel sheet, just tell me.
I have 2 different boards, the first is the same board with yellow jumpers and headers that zoomx has. The other type I own comes with an STM32F103VET6, 2 mini usb (one has an USB to RS232 ic), slot for the RTC backup battery and other things:
Sorry for the quality of the pictures, taken with a bad cellphone camera and bad lightning conditions. I will update tomorrow with better pictures