This build was disgustingly annoying, and required several horrible hacks to make it work.
The first problem - the CoolerMaster Nepton instruction leaflet suggested that I installed the radiator before installing the CPU block, as shown in the photos. This meant that I was unable to install the CPU block, and had to remove the radiator, and then install the CPU block.
Next, I realized that there wasn't enough clearance to have both of the fans in a push-pull configuration for the radiator inside the case - no matter, so I thought, as the CM booklet showed a configuration for installing fans on the outside. As soon as I tried this, I realized that the power cable housing on the outside of the SG10 obstructed the placement of a 120mm fan on the outside (see here: http://images.bit-tech.net/content_images/2013/07/silverstone-sugo-sg10-review/sg10-4b.jpg). I therefore had to reshape the 120mm fan and the housing (using a stanley knife and a soldering iron respectively, as I had no dremel) to fit my needs. After much blood, sweat and tears, this eventually worked, and after having cut some of the rubber off the vibration-reducing fan mount, I was able to install that too.
Next came the problem of the exterior fan being obstructed - at first I thought it was to do with the fact that I'd removed some of the fan housing - but nope - it was the fact that the fan grille on the back of the SG10 is slightly raised away from the mounting holes, and away from the main body of the case (this can also be observed on the image linked previously). I eventually decided the best course of action was to install some rubber washers between the fan and the mounting holes in order to push the fan away from the grille. This again eventually worked.
I then moved on to installing the GPU, but quickly realized that it wouldn't work - the radiator size of the Nepton 120XL was so large that it overlapped with the PCI port by about 1mm, pushing the card away from its correct slots, and also touching the PCB (possible short circuit). As I had no electric tape, I cut a piece of anti-static bag, and stuck it to the side of the radiator (as shown in images), and removed one of the screws on the GPU back plate which was causing clearance issues.
After having jumped through all these hoops, the system booted at the first attempt - a complete miracle, and has been working very well - but damn it it's heavy! I'm aware that the cable management in this build is absolutely abysmal - but I can't see myselfg improving it as the SG10 has no windows.
But the GPU and CPU aren't balanced I hear you cry! Well, I had to re-use my old GPU, unfortunately. But why are you using an 840 Evo!? That's old, I hear you cry! Well, I also thought that I might as well re-use one of my old SSDs too.