Chrys, this is the foundation I did a few years back
https://www.iceinspace.com.au/forum/...d.php?t=135718
It used to hold a lightweight pier and an EQ6 with FLT 110 imaging system.
I have since replaced the pier with a much heavier one 1500mm tall and have a CGX mount and a heavier system and the foundation has held up well.
I would recommend a heavy foundation as you don’t want to dig that out each time you upgrade your pier. Mine was way under 1 cubic meter but it’s solid.
Cheers,
Bo