u/Inevitable-Sale-3718

Hey guys,
I’ve got an older iFlight Nazgul5 HD Nebula Nano (2021 model) running:
Vista/Nebula Nano
SucceX-E F7 V1.4 stack
4S setup

I’m looking at modernising it with:
DJI O4 Air Unit
ELRS receiver

Just wondering:
Has anyone successfully fitted an O4 into this older Nazgul frame?
Did you need custom TPU/camera mounts?
Is standard O4 or O4 Pro easier to fit?
Any cooling or spacing issues?
Best ELRS receiver choice for this build?
Trying to work out whether it’s a straightforward upgrade or more trouble than it’s worth.
Thanks!