Ok, so I wanted to get all the panels done today, and went out to Maplin to get a few bits and bobs like HDD 5.25" adapters, and some 2.5mm heatshrink that I seem to have run out of (for wiring)
First of all I test-fitted the right side panel:



All good there, no clearance issues with the two 120mm fans for the radiator duct, nor for the three 92mm fans for the 8x HDD cage.
Next I tried the left side panel:


We have a word in the UK that was very apt at this point of test-fitting: bollocks. In this context, it sums up the following: "I recognise the problem of the panel not closing, and also that the reason for it is because the left edge of the Lexan window is pressing up against the 15mm lip at the rear of the chassis."
I had measured this, and there is a gap along the left edge of the window on the inside of the panel, but because I wasn't super-accurate at placing the window when attaching it, the window was about 2mm too far back! Bollocks indeed.
Hence my visit to Maplin, to buy a rotary tool (aka "Dremel")... I didn't fancy ripping the window off the panel, it would almost certainly end in disaster, so I used cutting wheels to cut through the 4mm polycarbonate... managed it with 3 of the thin cutting wheels, they're pretty fragile even though I was creeping along at snail's pace! Maybe I should have used one of the heavy duty cutting wheels, but meh, it's done.
Turns out I don't have to trim the radiator duct after all! Bonus! Because that would have been a ball-ache.
With both panels sorted, it was time to make sure the front bezel/door fit properly too.



Pretty much done with the side and front panels then. Here's the door open:

And here's the left panel, closed fully this time:


I'm going to remove the top panel and add some solid metal handles with panel washers and M5 screws. I'll probably leave that until tomorrow. First, I'm going to tackle running wiring around the case for the fans, creating groups of fans (e.g. the 3 fans on the PA120.3 -> group) and bring the groups up to a common location around the drive bay area, in preparation for my upcoming monster 36W max per channel fan controller (either 5, 6, or 7 channels)
Seems like only minor things left to do, but I know wiring will take a while, as will drilling the handle holes (the case is made out of the hardest steel I've ever worked with lol)