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Making your own keyboard is actually a fair bit more work than making a computer - making a computer generally involves installing the mobo into a case, plugging in a few cards, RAM, CPU and PSU, connect HDD or SSD and you're done.
Making a keyboard can involve as much as soldering all the components to the PCB, potentially customising the switches (e.g. different springs, landing pads), soldering switches on, choosing and soldering LEDs on, installing and even programming the controller, arranging a case and cable. And then you can start choosing from the myriad of keycaps available.
Surprising, eh?