This is more of a log of my findings, not an inquiry since I'll have solutions for most problems by replacing the common denominator in most of the issues and the "close calls" are just plain ol' SFF life 
I'm in the process of installing an HDPlex AC-DC 160W and a KMPKT Dynamo Mini 160W inside the LZ7 First Edition, but I'm having some issues with some components. These issues are basically because of the parts I want to re-use.
First issue: the KMPKT Dynamo Mini fits, but just barely because it sits right against the storage panel. This means that you can't use a 2,5" storage device in most builds with a direct-plug ATX DC PSU.
Second issue: the HDPlex AC-DC 160W power supply has a C14 mains connector where the LZ7's DC-DC rear panel has a cutout for. This works perfectly but with my Noctua NH-L12S there was a hair of space in between the housing of the connector and the Noctua heatsink.
Considering heatpipe coolers are rarely built with 0.1mm tolerances, this could have very well been worse (or better).
Third issue: on my Asus Maximus VII Impact board, the 24-pin ATX connector and 4-pin EPS connector are really close to eachother. just 1 or 2 millimeters of the PCB and the heatsink extend over the 8-pin connector's housing, which I'm trying to tim down, also because of the long cable not being necessary. This is ofcourse specific to some boards.
Fourth issue: the vandal switch I got from eBay is a little longer than what K888D supplies for the LZ7 if I'm correct, so this happens on my first edition LZ7 with the button on the top where later versions have the button in the middle. Mind you that in the middle there would be another problem if you used the Noctua NH-L12(S) cooler as it would probably block it, depending on orientations possible with the location of the CPU socket.
Fifth issue: the HDPlex AC-DC 160W power supply attached to the storage panel (the DC version) will sit on the Noctua NH-L12S cooler. What I can surmise is that it would fit with the top panel though, probably pushing it down ever so slightly.
Bottom line: DON'T use the Noctua NH-L12(S) in the LZ7 if you are going to be using an AC-DC or DC-ATX power supply, go for the Noctua NH-U9S which I'm going to add to basket in a minute. And don't be an idiot like me thinking random stuff will just fit
