I had mine built for me, as my skills with a soldering iron are sadly much less than my skills with a table saw, and those are questionable.
I picked a builder who wasn't offering his services, but who had built one for himself successfully. I thought it might help us both, as he might get some deserved attention, and I'd get a nice amp without the wait of the well known builders that were swamped with work.
That worked out exactly as planned, and was a very pleasurable experience on my end at any rate.
I have projects and plans with other builders as well (I kind of like collecting gear from people I admire), but also have a current project in the works with the builder of my ?22. That speaks to my satisfaction with our original projects.