Made some simple clamps for the Shapeoko out of some scrap red oak. Don't have a finished picture because I don't have a flush-trim router bit to cut off the tabs. Still learning feeds and speeds so the finish is also questionable.
Finally completed the dynahi. I really enjoyed this DIY processing. Based on previous experience, this time I spent more time on selecting parts and adjustment, also increased heat sink size, quiescent current increased to 75mA. The gain keeps the original design value (200K/10K) and there is no background noise even using high efficiency earphones. Thank you everyone for your experience and information on this thread.
https://www.shun-teh.com.tw/en/category/Aluminum-Extrusion-Heat-Sink-Above-width-200mm/A03.html
This company can cut heat sink size and drill screw thread holes according your drawing, even if you only need two piece. It is good choice if you want to design your own case.