Wanting to build Open ROV 2.8; have parts questions

Hi guys. So I recently discovered this world of Open ROV and am wanting to build my own ROV2.8…that being said I realize now that there are some proprietary bits, like the PCBs, that will have to be custom-made, and it also seems that the propellers are proprietary. Are there any other proprietary-discontinued parts that I should be aware of before deciding whether or not to dive in? Any good replacements for the propellers?

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