Honestly, if you lack the knowledge, you will probably give up before you get a change to begin.
Because 90% of your project will probably not be to build or design a keyboard, but to learn electronics and micro-controllers.
The truth is, you will probably not get anywhere with this. You may be filled with enthusiasm now, but that probably won't last for several months. You'll direct your interests to other things in your life.
Not sure what you define "a pile of money", but you should be aware of that the prices of stuff here in the group buys are much much lower then single purchases, just because of... well, the size of our orders. A alu case in a group buy here might be $150, but if you buy ONE custom designed case, you can expect to pay $300-400... for plastic...
Just the switches alone will set you back $90.
All of us here are keyboard enthusiasts. There is a reason we don't just build our own keyboards.