I built a holybro kopis with HDzero and ELRS and here is how i did it:
so i stared with building the frame:

then after completing the frame i started planning the electronics part of the build (the hardest part). There are a few things i dont't like about the holybro frame: the size of the stack area: it's on the small side for a cinelifter this makes it really hard to build the way you want it. And the way they made holes for the motor wires in the arms but they are two smal for 6 18 AWG wires so you cant fit both motor wires thought it. This makes it thay you still have to run one of the motor wires outside. but because of my ocd i had to run them both outside.

Here you see how i laid out the esc's and motor wires. I made a xt60 with 10AWG split to two 14AWG wires and wired them two the esc's in parellel.

As you can hopefully see the flightcontroller is kinda setup like a bridge between the two esc's this was done fore both heat dissapation and so that the stack wouldn't be to high.

after attaching everything (forgot the GPS and added it later) I was ready to close up the build and get to maidening!

About HDzero: It's awesome and i love running it on this cinelifter> It is over HDMI so i use a homebuild HDzero ground station.
About ELRS: I use the Matek diversity for the best lik i hope. I havent had a singe failsafe (obviously).
About the mamba h743: It's great awesome board layout and good regulators (9v 3a and 5v 3a)
For the 3d prints : https://www.thingiverse.com/thing:5337680