Default [Q] Nexus 5 Thermal Mod?

So I'm sure that a some of you have seen the mod that pyj08178 did. In a nutshell, it basically involves filling the 0.5mm gap between the CPU/RAM chip and the metal frame with thermal paste.

So I want to ask for those of you out there that have taken apart your N5, is the gap really 0.5mm? Lots of people seem to be saying that it's 0.5mm, but I was never able to find a source confirming that.

The reason is that I am also going to attempt this mod, but with thermal pads instead. Digikey sells lots of very thin thermal pads (down to 0.1mm in thickness), so I want to be sure that I don't get one that's too thick or too thin. Of course, I can get a few and try them out one by one, but it is a bit waste of money, considering that those thermal pads aren't exactly cheap.

Also, just curious, have anyone tried replicating pyj08178's mod?