Clamped the grill onto the top:
drilled the screw holes:
Drilled some pilot holes, for the jigsaw:
masked the whole top, to prevent scratching:
Fan holes have been cut:
and the grill fits perfectly:
Those are my dad's legs you can see.
Here is the top, back on the case, with the radiator installed:
with 5 of the 8 fans installed.
I still need screws to put the three others on the radiator.
Inside the case, looking at the top:
Next step is to make some holes, for wire management.
With a case this good, it'd be an insult to have bad wire management.
*edit*
you can't really see it, but there is foam between the radiator and the top of the case. It's a pre-cut piece of foam, that came with the radiator.
The screws are a bit long to attach the radiator directly, without damaging the radiator core.