I "built" a few of mine back in the days ... So to speak. Actually, a friend of mine who's a computer geek did all the work. Since he is more of a gamer and into video more than audio, I had to do the research for my own needs, usually on the Cakewalk newsgroups. I'd bring my findings and requirements to him and we'd figure out how to make that work within my budget. Once we had all the parts, I'd buy a case of beer and we'd spend an evening working on it. Or more accurately, I'd watch him work.
Then I'd wake up hungover the next morning and find my new PC all put together, vaguely remembering the rest of the evening.
I guess it's not entirely surprising that I ended up switching to Mac. I never really liked the challenge of figuring out the parts and planning and putting them together.
Heck, I've played guitar for 40 years and I never adjusted a truss rod or changed a pickup. I prefer to let other people do that. I admire people who like to tinker, build their own guitars and all, but it's not for me.