About 2 hours more work on the triangular base for the telescope dobson-mount.
Here I have added one more profile in the middle of the triangle which holds an 11mm diameter steel pin, around which the upper platform will rotate. Roughly 30mm high acetal plastic cylinders at the midpoints of the triangle-sides support the upper platform and will hopefully provide the right amount of friction. Too much and it will be hard to move the telescope, too little and it won't stay aimed at a particular target.
This is the upper platform, a piece of oak-board. The steel pin fits in a brass-fitting which is bolted to the center of the board.
This is how the two pieces fit together (upside down). The oak-board will rotate around the steel pin while resting on the three acetal posts.
To be continued...