I'm sorry to hear that, what Motherboard Socket are you using? With Intel 1151 there is exactly 70mm of CPU clearance to the underside of the SFX PSU, meaning the NH-L12S fits perfectly. I have not however tested it with an AMD system and so there could be a chance that the FM2 or AM4 sockets sits a couple of mm higher, effectively reducing the CPU clearance. But I'm not sure!
There are a couple of different options that can be configured to fit an internal DC-DC board and internal AC-DC converter, I'm sorry that this information is not more readily available. I will try and explain some options below.
Yes those are the right panels to get, the DC-DC mount can fit a range of different things, including the HDPLEX DC-ATX boards, HDPLEX AC-DC converters, generic DC-DC boards and also a single 2.5" HDD at the same time.
The DC-DC rear panel replaces the SFX bracket with a 92mm fan mount and a C14 cutout and adapter plates for attaching a variety of different DC jack designs. the rear panels also includes mounting standoffs for fitting a HDPLEX DC-ATX board to the rear (instead of 92mm fan).
So in theory using both of these DC-DC panels you can mount a DC-ATX to the rear panel and an AC-DC converter to the HDD mount panel, but this layout is highly dependant on what CPU cooler you use as it actually reduces CPU height clearance compared to an SFX PSU unless your cooler lines up just right in between the two.
Another option would be to also get the XL-Vent Top Panel which provides more mounting points on the top panel for extra case fans or other accessories, so you could actually mount both the HDPLEX DC-ATX and AC-DC converter to the top panel through the slots with some M3 screws and Nuts.
Putting all this together you have a bunch of different options, here are 2 possible configurations with CPU clearances listed:
For reference, the HDPLEX DC-ATX can be mounted to the DC-DC Rear Panel or DC-DC + HDD Panel. But the HDPLEX AC-DC converter can only be mounted to the DC-DC + HDD Panel.
The First Edition LZ7's used 3mm thick Acrylic for the rear panel, but for the production model this was increased to 5mm Acrylic to increase rigidity for mounting heavy power supplies. The shape is still the same, but the thickness is different, so you will see a small overhang of 2mm if you mount a production rear panel to a First Edition case.
The First Edition case used translucent Smoked Grey Gloss panels for all 3mm thick panels which included the rear to keep it simple. The production version uses Opaque matte panels, unless you specifically select a translucent panel, but these are only available as options for the side panels and not the rear panel.
However, please DM if you would like a new custom panel making from 3mm thick translucent smoked grey, I think I have some in stock.
