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MAX7456 schematics to use with AP_OSD

There is AP_OSD lib developed recently. As I understand it is primarily for the boards with integrated OSD chip. But under the hood it is simply communicates with OSD via SPI bus.

So it should be possible to build custom board with MAX chip (or use somehow MinimOSD board ?)
and connect it via SPI to a pixhawk-family FC.

Am I right?
Does anyone have any resources how to build that board?

Anyone have an idea on how to hack a popular minimOSD to use with AP via SPI bus?

Looks like this one is suitable

Servers by jDrones