The process of installing everything into the NZXT Zero was rather uneventful.  That's what I like to see from a case.  The top mounted 80mm fan actually had to be removed so that I could install the PSU.  There wasn't enough room to fit the PSU in without sliding the fan to the side.  Once it slipped in, however, there was more than enough clearance.  Here's a before and after.

Next up, I dropped in the motherboard mounting screws, laid down the motherboard and secured it.  I plugged up the 24 pin ATX, 4 pin 12v, and power button just so that I could boot to ensure I POSTed and there were no shorts.  Perfect here.  And as you can see, there's more than enough clearance between the PSU and CPU cooler.

Next up, I popped in my video card.  I have an X850XT which is a two-slot card, as are many of today's cards.  With the tool-less clamps that I've encountered in the past, I haven't been able to get them to clamp down on my card without some modifications.  In the NZXT Zero, however, that didn't prove to be a problem.  As you can see, the clamp snapped down securely on my card, and held it very firmly in place.  (I boosted the contrast of this image to try to help give you a better idea)