I made this triangular base for the telescope Dobson-mount we are building. It has three ca 640mm long 25mm-by-25mm aluminium profiles, cut at a 30-degree angle to make an equilateral triangle. It is held together with tapered pieces of 100mm wide 10mm thick aluminium bar that attach to the T-groove of the profile with M6 screws. Each corner has an adjustable foot.
The mount that goes on top of this triangle is also from 25-25 alu-profile:
Stay tuned for hopefully some lunar and/or planetary images when this project is done.