Qubes OS R4.0 & OpenBMC on Corebooted KGPE-D16 questions.

Hello All novice here

In my journey to live life with a very high threat model at all times.
I'm in the process of building a desktop/workstation & server that avoids Intel ME and can be corebooted.
Like ive stated before i am new to all of this.I have recently ordered a 2 KGPE-D16 boards from (https://store.vikings.net)
with Coreboot already installed since ive never corebooted anything before and im somewhat afraid to spend alot of $ on hardware.
that i might mess up.The challenges i see myself running into is in regard to what is listed in the installation notes linked here https://www.coreboot.org/Board:asus/kgpe-d16

Specifically the OpenBMC,EHCI debug console,& using "at least one real 8PIN EPS12V cable" per cpu talking points.Especially OpenBMC how do i even remove the proprietary BMC and flash OpenBMC? Also has anyone succesfully installed QubesOs R4.0 on this board with minimal issues?

Sorry if i carried on too long i feel kinda bad with the amateur questions seeing as this mailing list has alot of experts that are very knowledgeable in my eyes.Hopefully you all can help me out or guide me in the right direction to the best option for achieving my goal?

Thanks

Sent from Seattle, by way of Ann Arbor on Tapatalk: The Remix.