They have 2.5 mm Aluminium and Steal spline same thickness it must feel like a Tank.
Think they maybe need it for the tophats if they gone with 1.5 mm instead it have been lighter in weight.
Even the bracket for Psu are 2.5 mm.
Yeah :/ that's too heavy. Not a problem if you don't take it out of home/office, but not good if you want to carry it often.
Just for comparison, I just put a basic frame (not yet complete case) with makerbeam's 1010 aluminium t-slot profiles (12*22*32cm - the final build would be little bigger because of radiators+fans at around 12*26*35cm) and it weight at just over 300gr and if plenty strong (I'm looking forward to compare with makeblock's low-profile 0808 & 0412 beams which should be even lighter and allow more mounting combinations).
Of course few brackets will be needed to mount the modo, gpu & psu and some grates/filters but with strong frame these don't need to be thick and heavy (not they need to cover the full surface of mobo or gpu for that matter)
My point is to compare for example:
Louqe S1 case + L-TopHat (3kg) and a full liquid cooling build (both CPU & GPU in the loop)
3cm thick 240 copper/brass radiator is about 700-800gr , and 4.5cm goes to 1200-1300gr
A copper/nickel GPU water-block alone can be up to a 1kg too.
So a heavy system would start from around 5.2kg (without mobo, gpu, psu, cpu-block, pump, pipes & cables, which should weight about the same anyway)
The light alternative can be under 1kg frame/case
two: 240 + 120 aluminiun radiators at 500gr both! (I plan to have the 240 on top, and the 120 at upper-front sides)
and aluminium GPU water-block at around 400gr
totals at around 1,900 gr (about 2.7 times lighter!)
With strong frame I plan to use dust-filters for most of the walls, so that should keep it very light and breathable.
So while there's a (custom DIY) option to go lightweight m-itx build at around 6kg for the whole system, but Louqe S1 isn't the one to use for that :/
Which is a shame because the Ghost S1 design is otherwise great!
Imo for the next phase they should go for fully modular case - since it's delivered IKEA-style and you have to assemble it anyway
So thinner walls with various sizes can be offered, and more perforated for higher air-flow and lower-weight. Also about 12cm wide case option would be great since for fully-water-cooled builds you don't need the extra width (as air coolers would need), but it can be a problem to find compatible backpack to carry it in (but 12-12.5cm can fit in most large-laptop backpacks).
a 14cm wide case can also be used for water-cooled builds with 140 fans/rads (though that currently can only be heavy build since there're no 140mm based alu-kits :/)
