akex005 The brown switches will be available when banggoood gets more stock of them. Yes it is compatible with MacOS, there's a switch at the top to go between windows and Mac

akex005 it uses a 3 pin layout so it's compatible with kailh, gateron, cherry, ttc and a whole bunch more that also takes the more common 3 pin design

akex005 These will not work natively with alpacas because the PCB is for 3 pin switches, alpacas have 2 extra legs making it a 5 pin so it will not work unless you chop off the extra 2 legs. Time consuming but doesn't affect anything significantly, the legs are there to reduce the wobbling but it should be fine if you want to do this.

akex005 You can change the keycaps definitely, but the 63 key layout means there might be a smaller range for you to choose from because of the narrow right shift key and unusual layout. Just be careful its the right layout.

akex005 yes

akex005 The loudest, red is more silent

akex005 yes, there is a program on the 'driver and support' section on the blitzwolf website.

akex005 There are optical gateron switches on the market which you can buy for this keybaord however I don't think there will be an option to purchase with yellow switches pre applied on the board.