Hi DarkKnight24. Welcome to Geekhack.
People seem to routinely design their own PCBs, have them manufactured, and/or design their own case and plate, and/or hand wire all of the switches without any PCB at all, so nothing about building your own board sounds far fetched.
I like mostly vintage clicky switches like SKCM blue Alps and capacitive buckling spring. I like Kaihl's box jades and navies for modern boards.
If you want to assemble your own board, want something solid, and only want to spend that much, the
Heavy Metal Keyboards GB is all that I'm aware of that kind of fits. I don't follow a lot of that IC/GB stuff though myself. You would still have to get switches. I have two of these on order myself. I do not believe that they have any LEDs.
You can get 60% aluminum cases on Aliexpress for reasonably cheap. I ordered a DZ60, which allows dedicated arrow keys, and a 60% walnut case for it a while back, but they've yet to arrive, so I can't comment on that.
What switches have you tried? Which have you liked?