Hi Sergey,
the SD card is not really an issue, I can always hardwire one adaptor with a micro-sd inside.
I did not know that you already have a DC/DC on board. Where can I check the schematics? I have not found them in the wiki.
Does it have JTAG/SWD available?
This extra 1.4cm is just the space that I have for wires :(, but this is only a personal issue that could be got around I guess.
However, I do not like to waste space and weight. In a small plane, when the autopilot is at the nose, it makes a significant difference.
Many thanks for the info Sergey,
Héctor