Steve Deckert sells these Decware ZKIT1 DIY PCBs for $45. I bought two. Then I bought the parts list. Then I designed a chassis around the PCB. I didn't build the chassis, I'm not a woodworker. Anyway, this is my first DIY project, my first time building an amp, building a tube amp, first time really soldering. Some of the mistakes I made along the way (shielded wire) were very beginner like, but the amps are done, they're quiet, and they sound incredible.
Currently hooked up as monoblocks with my Emotiva XSP-1g2 pre-amp and ESS AMT-1a pyramid speakers, which are 6 ohm and 93db, so the little 2.3w SET amp moves them just fine.
If I were to do it all over, I'd create a 4" height chassis instead of 5". Unseen on bottom is a vented black plate. Still need spikes/feet, and a knob for the volume pot.