Case Steel thickness 0.84mm(approx)
Dampening material 2.8 mm (approx)
I used a dial micrometer on the Steel case and a Vernier Calliper on the dampening material. Total thickness would be the sum of the above i.e. approx 3.6 mm to 1 decimal place
This is why I like SPCR. I have no idea what a dial micrometer or a Vernier Calliper are, and I certainly wouldn't think to buy one. Yet, some decent soul uses them to give me some measurements to help me with a case mod I'm planning. Thank you very much, Stori.
Adding the 5mm acrylic after removing the 2.8 mm dampening material from the steel panel should at least give you a 'mighty' 4 mm of Clearance (based on acrylic window being placed on the inside of the Steel panel and assuming my calculations are correct
I'm only using 3mm acrylic for the window, and if I forego the U channel and just use 'Tape of the Gods' (providing the cut out is clean and filed smooth) that would give me a 'lofty' 6mm of clearance between the TRUE and the window. I'm contemplating lapping the TRUE if it needs it for better contact, and that may give me 1mm. Which means a possible 7mm clearance, which is just crazy
The manufacturer Fractal Design have also been planning to come out with a windowed side accessory for these cases, just in case you'd consider waiting a while to see if that happens. Drop them an email if you're interested, they want to hear about what users want to see.
I think I remember reading somewhere that Fractal Design are planning to do that. Certainly, I do recall looking at a forum thread on one tech site (possibly Bit-Tech) where a FD rep was asking what people wanted for the Arc case(s). It was pointed out then, and I'm happy to echo the point now, that this is what makes me believe Fractal are a company that will continue to do well, simply because they are prepared to undertake such a basic task and get input from the community. Rather than following the logic of other case manufacturers who just put out a new product and think we'll love it, like the salivating dogs we obviously are.
I don't think I'll email them though, as I suspect that if they do release a windowed side panel, it will just be a clear acrylic. And I'm planning on buying a piece of purple acrylic for the window, to help with the colour theme for my next rig. Incidentally, if anyone knows where I can maybe purchase the whole gamut of female PSU connectors in a dark green colour, please let me know.