Two things got me into building my own starting at an early age. 1) money, and 2) Getting screwed hard from just enough audio specialists. It isn't always about doing the job better myself, it is more about knowing what actually goes into the finished product.
So, speaker building, and preamps, power amps, crossovers, phono preamps and so much more have kept me busy over the years. I wouldn't have it any other way looking back on the whole thing.
BTW, I would love to post photos, and have done so for my audio system page here, but at the forum, forget it? Make something that serves all of us, not the just the tech crowd. Just something that I can drag a photo from my desktop.
You say, 'it's easy, all you gotta do is this, then this, then that, then more.... Same thing that I could to someone in my woodshop, or my electronics shop. It's easy.