Yes

Yes, it can fit most of the cards in the market, up to 330mm length.

Height limitation is 2 slot max, those 2.5 slot card like Palit Jetstream/Super Jetstream/Gamerock, Zotac AMP Extreme won't be able to fit in this case.

The cons of this case is the limited amount of HDD/SSD slot, if you have many drives then this will be an issue for you.

RAM price is always like that, changing almost everyday.

Another possibility is the seller is still selling the LPX at old price so the LPX is slightly expensive than LED.

Performance is around the same if they have similar speed.

You mean the PCIe slot? Don't worry it is very durable 

The real cause is the card, either too heavy or too long and causing slight "bending" or "flex", it should be ok because the PSU shroud of this chassis is very close to the GPU which can act as a "support" to the card.

No

You don't need to setup any raid
Just install windows on the ssd and make as C drive

HDD can be the D drive

Its ok like that no need to do anything

Rig only?

Intel Pentium G4400 - RM 225
ASRock H110M-HDV - RM 245
Corsair 8GB DDR4 2133MHz Value RAM - RM 171
Palit GTX750Ti 2GB GDDR5 StormX - RM 488
WD Blue 1TB HDD - RM 215
FSP Hexa+ 450W - RM 166
Tecware F3 - RM 119

Total: RM 1629 (ETech price inclusive of GST)

What software do you use for editing/designing the clothes? If it uses GPU hardware as accelerator then I might include a capable GPU for it.

The situation is a bit interesting here as fitting an i3 + a decent low end GPU (like GTX750 2GB) will cost slightly more than the available budget, if we "downgrade" the GPU to something like GT730 to keep within the budget, the iGPU of the i3 is technically faster than the GT730 which makes no sense to do this. So I opted for i5 build instead without any dedicated GPU.

Intel Core i5 6400 - RM 802
ASRock H110M-HDV - RM 245
Kingston 8GB DDR4 2133MHz Value RAM - RM 198
WD Blue 1TB HDD - RM 215
CM Elite Power 350W - RM 126
Asus DVD-ROM SATA - RM 69
Armageddon Vulcan V1x - RM 75

Total: RM 1730 (ETech price inclusive of GST)

144Hz is on your way 

Try to look for BenQ Zowie XL2411 or Acer XB240H

Both monitors listed by me aren't GSync ready, the two you listed above are also not available in Malaysia either.

The cheapest GSync monitor here is Acer Predator XB241H (around 1.9k), it doesn't worth the money anymore after Dell S2417DG entered our market at almost similar price tag (around 2k) but with a higher resolution (1440p instead of 1080p).

RRP for Dell S2417DG is RM 1949, GSync is expensive, need prepare around 2k for that (add more if going for ultrawide or IPS panel  )