Precursor (https://www.crowdsupply.com/sutajio-kosagi/precursor) is interesting with its use of an FPGA.

by modern do you mean just the capabilities of or include the size of as a requirement? If you accept that a DIY processor can be the size of a room and not be portable, then maybe???? Expecting a DIY to be miniaturized, then hellz to the naw

I wanna say I read about some high schooler recently making _a_ microprocessor in his garage, but I'm guessing it's a very simple one, not what we would consider a modern design.

Also I could be thinking of something else entirely so, before repeating this, you'll probably want to google it.

Nope, even an EUV light source would be close to impossible.

no. and even if it were then are people whose job is to make sure it never really takes off.

why? because power.

what do do about it? get power. how to do that? dunno. If I told you then my own purported (and protracted) attempts would diminish. at least we don't get assasinated to death anymore..... ahahahaha (just our characters, andor career prospects, etc)